Federal 5.7 going for $33 a box now on Gunbroker. CTD, Cabelas etc still asking $50 a box.
Your deal thru Mrs S is probably a whole lot better, but prices are starting to come down a tad bit on some ammo. Some is still too high-priced and simply unavailable.
500 rounds for $330? I remember paying $249 for 1,000rnds of .45cal ACP 230gr HPs (less for ball), way back when.