I surf my local classifieds and a guy from Union has listed an AR with 100 rounds of ammo. If you are near Union and want 100 rounds he might split the gun from the ammo. He doesn't say either way.

His number is 314-226-3334. I only list his number because he listed it on the web first.  

lunyou

What about the AR?  Come on man don't hold out on us.

The seller doesn't sound like he knows what he's got.  
Here's his description:  
    I HAVE A NEW IN BOX, NEVER FIRED, FLAT TOP, REMOVEABLE CARRY HANDLE, 4 POSITION COLLAPSABLE STOCK 16" BARREL WITH 2 30 ROUND CLIPS ALL PAPERWORK AND SLING.  WITH 100 ROUNDS OF AMMO.  PLEASE CALL: 314 226 3334  RICK  

$1095.00

It's listed as Rick aka AE Firearms in Union.  Never heard of either.  

It's on rollanet classifieds.  There are probably 2-3 ARs/week on the site, most of them overpriced.  

My $.02.  

There's also a complete lower, minus buttstock,buffer, spring, et al... for $325 on rollanet.  And, a bushmaster upper on tactical innovations lower listed in Lebanon, tapco collapsible.  Looks like an A2 upper and some type of gangster grip.  Looks like a build.  He's asking $1150.  
And.... 420 rounds of 5.56, 240 wolf 5.56 hollow point, non lacquer steel case for $110 and a 200 round battle pack of PRVI Partizan 55 gr for $125.  

Ought to check out the site.  There are some knuckleheads on it, but every now and then I run across a diamond in the rough.