I'm still working on mine, but the costs are going to be pretty much the same. The big savings in the NFA world when going the trust route is whether or not to involve a lawyer.

Tax stamp: $200
Trust: $10-$40 with Quicken (depends on the software version you buy) or $100-$600 with a lawyer. If you have a CLEO that will sign off, you're out time and the cost of photos and fingerprints.
Notarization of trust: $10-$20 at some notary public but probably included with a lawyer's fees.
Making copies of forms and sending to ATF: Can't be more than a few dollars.

If I'm missing something, I'm sure someone will chime in.

No problem.

Oh, no, don't do this to me....The AR that I am going to SBR is currently in parts. I think I have everything but a stock (I will run it in a pistol 'til the stamp arrives) and I used premium parts. You can do a basic SBR for much cheaper, say by buying a complete BCM or LMT upper and picking up used parts off the EE (my upper and charging handle are used). Also, not all of my accessories are necessary and are a matter of personal preference. Further, I still need to pick up a vice and torque wrench to assemble myself, which also increases the cost. I would like to be able to work on my own guns, so it seems like a reasonable investment to make.

Noveske lower: $200 (you can find a lower cheaper and I definitely overpaid)
DD 10.3 barrel: $256
DD low-profile gas block: $56
Gas tube: $12
Colt upper receiver: $155
Colt BCG: $150 (took out of a complete upper that I sold)
PRI M84 gas buster charging handle: $70
DD Mk18 RIS II: $308
KAC 300m rear buis: $77
KAC taupe front buis: $186 (this one always hurts but it's worth it)
G&R Tactical LPK: $55 (no grip included)
LMT receier extension, castle nut, CMT H2 buffer: about $50 but it's hard to say since I got most parts in a kit
Magpul MIAD grip: $42 (also bought a CR123 grip core)
Magpul BAD: $25
CQD sling mounts (front and rear): $59
Optic: won't be getting that for a while.

Total (gulp): $1546

That number is actually not that bad considering the parts that I have in this thing. Add another $100 or so for a stock (probably more since I will most likely want a SOPMOD). That's about par for the course for a top-of-the-line AR. You could probably get a factory SBR (e.g., Colt 6933) for a little less but you will also have fees for Form 3 transfers (dealer to dealer). I like that I get to have all my parts on hand during the whole waiting process.

Factory Built LMT SBR:

NFA Trust - $125.00
LMT 12" Piston CQB MRP - $1800.00
Tax Stamp - $200.00
Aimpoint H1 - $550.00
GG&G QD Mount - $195.00
AAC Muzzle Brake Supp. Mount - $150
Magpul AFG -$30

$3050.00 for SBR and optics, add another $1200 for my AAC M4-2000 including another tax stamp

Spikes Tactical 10.5" complete upper- $500 (gunbroker.com)
SAA blank lower- $67 (local gunshop)
PSA MOE lower build kit- $140 (palmettostatearmory.com)
YHM specter length quad rail- $115 (palmettostatearmory.com)
Magpul MBUS- Somewhere around $75ish (botachtactical.com)<not recommended
Engraving- $45 Local machinist

Total- $875 + $200 tax stamp

I think I built a pretty nice and reliable SBR for a very good price.

Let's see,

$400 for a mini Draco
$200 for the stamp
$5 for the trust ($100 spread out over a bunch of nfa items)
$40 for the folding stock

Not even $700 all totalled.

That doesn't count the Trijicon sight. That cost almost as much as everything else!

Az

Trust: $600
Tax Stamp: $200
Copies/Forms/Mailing: $5
Surplus Arms & Ammo Lower Receiver: $70
Dealer Transfer: $10
11.5" Rifle Kit from M&A Parts: $545
Magpul MBUS Rear sight: $55
Red Dot Sight: $45

Total Cost: $1530
Weapon Cost: $925

At least it wasn't as bad as my two MP5's...

I did mine as an individual

Factory built Double Star AR-15

Basic SBR $1100ish (I dont remember exactly)
Dealer fees $100
Tax Stamp $200 & (5 months wait)
Magpul MOE stock & pistol grip (used package deal) $60
BCM gunfighter CH $50
Sling I found in a box at my dad"s FREE!
YHM 5.56mm suppressor $540
Another Tax stamp $200 & another 6 1/2 months wait

$2250 isnt too bad

Yugo M92 SBR

Kit: $450
Bulid: $400
Stamp: $200
CLEO signodd and fingerprints: Free

Total: $1050

Lower:
LMT Defender 2000 - $405
sold the ergo grip + $15
sold the M4 Stock + $20
B5 Sopmod - $100
MIAD - $32
Mapgul ASAP - $29
magpul BAD - $29
Stamp - $200
Finger Prints - $10
Passport Photos - $8
= $778

Still no upper yet, stamp is still pending but it'll be:
DD 10.3" Upepr - $409
DD MK18 RIS II - $335
DD BCG - $149
Gunfighter CH mod 4 - 45
AAC blackout 51t - $95
Troy front/rear - $220
Tango Down short QG vertical grip -$90
Larue offset flashlight mount - $125
=$1468

Other things I still need
BAD ASS - $80
Geissele SSA - $180
AAC M4-2000 - $1000
Suppressor Stamp and associated BS - $225
=$1485

I've also already got an Aimpoint H-1 in a larue mount - $600
BFG two point sling -$40
Surefire G2 LED with Clicky tailcap - $100
=$740

Grand total will be $4,471

I've SBRd Ruger 10/22's and had less than $400 including tax stamp in them. I've SBSd shotguns and been in less than $350 total. I also have $4000 plus AR SBRs and also have $15k+ MGs. It just depends on what you want and what you can afford. I would seriously consider going with the Apple Law Firm for trusts. The Quicken route may get you approved, but where it stands to have issues is when you are dead and gone and your heirs have your weapons and the trust is invalid which makes the heirs possession illegal. YMMV

Actually yes there are documented cases where the trust was deemed invalid and firearms were forfeited while settling a decedents estate. I'll have to track down the documentation and post it up. But do what you want, it doesn't affect me one bit.

Noveske has raised their prices, not sure if its due to demand or lack of materials/increased production cost. I was able to get the old price since I've been working on my order for about a month.

Even still....

Rifle: $2200
SDN: $900
Optic: $600
Tax stamps: $400
==============
$4100 before slings, foregrips, illumination or ammo.

This is the first time I have really sat down and figured up how much I have in mine and I am kind of afraid to see the results but here it goes

Spikes Tactical custom 12.5 factory sbr $989.00
LMT Sopmod $199.00
Noveske QD Receiver End plate $21.99
Tango Down Battle Grip $39.99
Knight Armament Company $25.99
Geisselle SSA-E $229.99
Bravo Company Mod 3 $49.99
Rock River Arms Extended Safety $15.99
Troy Industries Rear BUIS $115.99
Troy Industries Front BUIS $125.99
Meprolight AR-15 Tritium Front Night Sight $42.99
KNS Trigger Pins $29.99
Aimpoint Micro T-1 in Aimpoint QD Mount $625.99
Troy Industries TRXtreme 11 in $169.99
Daniel Defense Low Profile Gas Block $40.99
Troy Industries Modular Combat Grip $70.99
Noveske TRX QD Sling mount $19.99
Larue Tactical 2 Point Sling $95.99
Surefire E2D LED $189.99
Surefire E2D LED Z68 tailcap $35.99
Gear Sector Surefire E-series mount $52.99
Surefire FH556-212A $129.99
Surefire 60 round Magazine $129.99

Trust $300.00
Tax Stamp $200.00

Total for the weapon before the lawyer and stamp $3449.79 + sales tax
Total for everything $4122.28

I am going to have more money into it before I am done though, I am going to swap lights out for a Surefire M300A Scout Light and a Gear Sector mount for it, a Surefire 212A, a Trijicon TA33, and at somepoint Im probably going to be putting a Daniel Defense 12.5 pencil barrel in there.