Well you know better than anyone what you are ready/able to take on. Ackies eat a lot and require a very hot basking spot.

This is an excellent ackie care sheet. After you read this you should have a better idea of their care: http://www.proexotics.com/care_ackie.html

It's pretty easy to find ads on kingsnake or fauna classifieds for ackies. I don't know of any particular breeders.