Do you like the case?
I just got one of these
http://www.otterbox.com/iphone-cases/iphone-3g-3gs/iphone-3g-3gs-defender-case/
They are less than $30 if you shop around. I am tough on phones that I wanted something to protect it better with. The jury is still out on it, but it does seem like it will protect it well. There has been problems with a oily looking looking film between the phone and the cover and mine was worse than most. Last night I layed down a layer of seran wrap between the phone and case and it is much better now. But if someone had a nice protective iphone case I would not mind seeing some other options.
