For C-41 (colour negative), I pay about $1/roll at the local supermarket for one hour service with no prints. I've never had a problem with them, though it's worth experimenting when trying a new lab (i.e. don't drop off the most important shots you've ever taken).
For black and white film, I do my own developing at home. I have a changing bag to load it into the developing tank, and I do the rest in the laundry room.
I haven't been able to find a local place that will do slide film for a reasonable price. I'm investigating options like dropping it off at Wal-Mart or Costco for mail-in service.