I've used AmmoSeek.com a few times when I was searching for 9mm and .308 ammo, and overall, it was a pretty good experience. The site does a decent job of compiling prices from various retailers, so you can really compare what's out there. I found some deals that were quite a bit better than my local shop, which was a nice surprise. Just a heads-up, though, I've run into some listings that weren't updated regularly, so it's worth double-checking the seller's site to make sure the availability and pricing are still accurate before committing. I didn't encounter any sketchy sellers myself, but make sure you're buying from established retailers if you're concerned. Just like with any online purchases, read reviews and check their return policies. Overall, I'd say it's a useful tool if you take some precautions.