Oh no! That is not good! The first place to start would be corporate Sprint store and/or an Apple store. If they do not have any available let me know and I'll see if I can track down one for you.
I have an iphone 5 and i was curious of why there was a sim card slot, so i opened it and took the sim card out. i sat it on the counter of my kitchen and went out to eat. when i came home my card was gone. i was wondering how do i get it replaced?