Unfortinatly, military caliber ammo prices go up during wars. :? XM-193 and even the cheaper than hell training ammo XM-193PD is getting more and more expensive by the week. I use to be able to get XM-193 ammo packaged in 20 round box's within a 500 round case for around $55 per 500 rounds. Now its twice that price.
How much is the place you use to get it from asking for it per 500 rounds? Everywhere i can find it now its around $200 or more per 1,000 rounds.

So to answer your question, but not really answer it, every one is raising there prices, not just one or two stores / companies.
The Rifleman