I think they may have some free ones, but I bought a cd from them, Dry Studio Kit, that has lots of loopable beats and individual hits (to make your own or modify loops) in .wav format. They also have more genre specific stuff.
[FONT=Palatino Linotype]"Bust a nut!" - Dimebag
"Imagination is more important than knowledge." - Einstein[/FONT]
"Imagination is more important than knowledge." - Einstein[/FONT]