I need a second pair of Level III or IV medium-size (9.5" x 12.5") SAPI cut plates, under an inch thickness, no steel.
Any suggestions for a good vendor with great customer service (replies with your experiences better) would be greatly appreciated.

And please don't tell me "Just buy where you got your first set" because those were from Australia.

Its all about how much $$ you want to spend.

Midwest armor sells some really good new plates. But are expensive, theres a 10% off code  "10mm " for them from a guy that makes Youtube video's. Midwest Armor I have 2 sets of their plates. Easy to call them up if their is any problems. They have good sales once in awhile. They throw in a lot of swag ( free armor hanger, constitution, Peanut M&M's.) All their plates have a waterproof Rhino lining.

Picked up a set of SAPI's in the plastic for $200 on gunbroker.

Bulletproof me.com

High Comm plates .

Did you piss off some Aborigines?  Why can't you get another set from Australia?

I bought my first set as a piggyback purchase for a larger bulk order and was a one-time deal :P

I bought my SAPIs from Bulletproofme.com   The guy has great customer service and offers triple curve, multi-hit, at a great price.

Appalachian training - great comms

They have LTC plates that fit what you need.

How much for a set of Level IV SAPIs from bulletproofme?

maxpro plates from galls