http://www.loopmasters.com/This is one great site I didn't see mentioned. Any genre you can think of, is probably here. (Well, maybe not Bluegrass, but who uses samplers to make that genre anyway?) The downside is, they'll probably give you more samples than you'd need no matter which sample pack you buy, but then again, you just might find what you're looking for. Also beware to make sure you select the correct files you want before you purchase and download.
http://primeloops.com/?utm_source=PL+Ne ... dium=emailThis is another site that probably has what you are looking for, and you just find the right one, buy and download, and you're set. Again, you'll probably get more than you'll ever use, but the fun is finding the holy grail sample you need, tweaking it to perfection, and laying it down with your ESX/MPC/DAW, and you're off.
Hope you all have fun.
Oh, one more thing, if you read/collect Future Music/Computer Music/MusicTech magazines, they'll give you a dvd-rom chock full of samples, and usually a collection of samples from the 2 sites I just posted. You collect enough of those mags and the samples they give you, and you'll probably never need to really go out and buy samples ever again.