I've got to say that I think that mail order film processing is often not the best solution. I had a roll get lost in the mail a couple of years ago and I was done with that for good. It just takes one time.
Luckily, I found a great place (Express Photo in Livonia, MI) that does the best developing/scanning for the money I've ever experienced. I've been shooting tons more color film just because I have an easy/cheap way to get it developed and scanned. If they ever go away, so will my desire to shoot color film.
I don't know how, but I would love to see more retail labs across America. It's probably an unrealistic dream, but it's a worthy one.