paid packs:
sunny lax kick packs
black octopus monster kicks
zenhiser trance drums 1/2
free packs (and also awesome):
hyperbits sample pack
bastian salbart free kick pack
i really love collecting kick samples, i could go on for days. these are at the top off the top of my head, though
as far as processing goes for my kicks i keep it very minimal, generally finding the right kick + shaping the sample ADSR + balancing the kick & rest of the mix in volume with maybe a bit of EQ is all i do. otherwise, if i have to do more i can almost always find a better kick to work into the track in the first place.
honestly these days i mostly finish a track then go back and swap the kick out til i find one that fits just right with the bassline/groove and then adjust as necessary