Can't help ya with Houston. My film goes to a camera store in Springfield, IL. which has a send-out service to a lab in St. Louis. C-41 develop only is around $4/roll. Add $2.99 for a CD at time of developing. If you want cheap 4x6 prints, Wal-Mart will print from the negatives for 25 cents a piece. If you upload the scans to the web site, the 4x6 prints are 19 cents each.
The cool thing about the lab that does my film is that it takes the same amount of time for them to do 35mm B&W, 35mm E6, and 35mm C-41, unlike most other places which make you wait at least a week longer for B&W or E6.