So you bought the 5.7 at 2A? I played with it the other day. I have a suppressor rated for 5.7, so I was tempted, but at ~$1K, I passed. I figured it wouldn't be there long, though.
I did not realize that 5.7x28 is so expensive now! When I purchased my PS90 and fiveseven pistol, I picked up about 5000 rounds of SS195LF. Last count, I have about 3700 rounds left (one 2K rnd case is still unopended). That would be worth a pretty penny that could finance my next purchase. (thinking out loud)