I just bought some Tri-X 400 for my dad's old Yashica-D. Gonna play with it at some friends' wedding tomorrow. The closest lab to me that'll mess with 120 is about 45 miles away, though.
There are a few good mail-in developing shops around. I've had good experiences with Adorama, and I think B&H does it too. I have to admit it's been at least a couple years since I sent anything in to Adorama, but I remember their prices being reasonable, their quality great and they were pretty quick. The best is to develop the film yourself, but not everybody has time for that.
You order some mailers from them, and I think they're prepaid. If I remember right, there is an instruction box where you can make special requests on the development.
Plus they do slide film of all types, so that's a bonus.