I've used AmmoSeek.com a few times, and I have to say, it's been pretty handy for comparing prices. I was in the market for some .223 ammo and found a couple of retailers offering it at decent prices. The site works well for getting an overview of what's out there, but I've learned to double-check the sellers' ratings and reviews before committing. There are a few sketchy sites linked, so it pays to be cautious. Overall, I haven't run into any major issues, but my advice would be to do your homework—don't just trust the price you see. Good resource, but like anything else, a little diligence goes a long way.