What kind of drum sounds are you after? Acoustic, breaks or electronic?
For Acoustic (at least snares;) see if you can track down Johnny C's Vintage Snares. There's also a Kontakt library called Studio Drum Kits that is unreal.
Breakbeats: you really can't beat Dogs On Acid

(if you dig on there you can find
basically every break you can imagine that's been used.
for drum machines... there's a refill called drummer boy that has all your basics in it, 808,909,606 etc... The tape 808 and 909 as mentioned above are excellent too.
I personally grab drum samples from wherever they sound good, sample packs, breaks, DOA ....