Send the $7 to a friend or family member of yours that trusts you not to reverse it on them. Have them hand you a $5 bill and two $1 bills.
Put the three bills in an envelope along with your bitcoin address and mail them to me (contact me via PM and I'll give you the address of my P.O. box).
When they arrive, I'll send you $7 worth of bitcoins at whatever the BitStamp rate is at that time.
Simple solution, yes?
really nice solution , but only if the O.P. wants a clear deal , if he wants to scam , he would hate this idea