I recently saw (through the evil forum) that Sportsman Guide (of all places) had PCM X-TAC XM193 55grn FMJ (brass cases with boxers primers) for $323 a 1000 round case, delivered, for members.
So after the $29 membership fee the total order was $1615 for 5 cases delivered (5000 rounds) and they sent two $10 dollars gift cert's.

I was ordering the PCM XM193 from Ammoman.com for something like $365 a 1000 rnd case delivered, but they consistently ran out of stock, and it seemed like I could only get like 2 cases at a time.
Anyway ...... that puts them as just over $.32 per round.
Since I don't want to reload 5.56 for plinking/3G, and and I sell the once fired brass to get closer to reloading price, and/or pay for my .223 brass and supplies to reload for my long range gun ......... I'm a happy camper.