Manual Camera for iPhone - Custom exposure for your iPhone camera
Disposable Camera App - A roll full of surprises, printed and shipped for $12.99
Halide - A premium camera for your phone
EverChanging: Disposable Memories - Disposable camera app that doesn’t suck.
Nizo - A better iPhone camera for shooting film
Printsnap - Disposable camera plugin for Snap — mail photos to your door