Ammoman sent out an email saying they have a special sale on Prvi M855. $349/1000 (shipping is included) is a pretty decent price — normally I’ve seen it sell for over $400/1000, without shipping, from other merchants.
I’m a big fan of Prvi’s M193, but have been looking for M855 for a while, and snapped up a case while it was available.
Update: D’oh. AIM Surplus has it for even cheaper, even with shipping taken into account. Of course, I discover this after I place the order at Ammoman. Live and learn.