For free? There should be some with Logic?
If not - BFD do sample packs based on real drum sounds and how they are mic'ed e.t.c so you can get different sounds.
I also believe hospital records have a few sample packs available.
All the drum & bass loopmasters sample CD's! Dave Carbone, Danny Byrd, Drumsound & Bassline Smith! Also, the Aquasky one is quality and ive recently got one of the Vengeance Sample packs, pretty expensive but well worth it!!!