Here is a list of breeders I don't hesitate to buy from:
BRB Reptiles
NERD
SW Reptiles
RC Reptiles
Reptile Rapture - This is a reptile store local to me, but they do breed ball pythons and ship.
Royal Constrictor Designs - Garrick is fairly local to me so I have quite a few from him
CoiledConstrictors - a BP.net member
Jason Weinrich - On fauna as Get Sum

I can't say they are the best but I personally have had great experiences with all of them. There are a lot of breeders that have great reputations and that's what you want to look for. I'm also always adding to my list because as long as someone has what I'm looking for and a decent reputation I will give them a try.

As far as caging goes, it really depends on what you want to spend. I've heard a lot of people say ARS and Freedom Breeder racks are some of the best, but they are also expensive. Ainmal Plastics, Vision, RBI and Boaphile racks are a different style of rack that I have heard good things about as well. If you want to build your own there are lots of tutorials in the DIY section.