I've used AmmoSeek.com a few times, and overall, I've had a pretty good experience. I was specifically looking for 9mm and .223 ammo, and it really helped me find the best prices across different retailers. The site does a decent job of keeping the listings updated, but I'd still recommend double-checking the retailer's site just to be sure the prices are accurate. I did run into a couple of sellers that seemed a bit sketchy, so if you notice a deal that seems way too low, it might be worth doing a little extra research before you commit. Just always check feedback on the sellers if you can, but for the most part, it's a solid tool for finding what you need.