I've used AmmoSeek.com a few times when I was hunting for some .223 and 9mm rounds. Overall, it's a pretty handy tool since it aggregates prices from various retailers, which saves a lot of time. The listings have been accurate for me, and I found some good deals compared to my usual sources. However, I'd suggest checking the individual seller's reputation through other forums or reviews, just to be safe. I did come across a couple of sketchy sellers with slightly lower prices, but a quick search revealed some negative feedback about them. So, it's best to trust your gut and maybe stick to known sellers if you can. Just keep your eyes open and you should be alright.