This kind of scam is not new @reeseshara, but it's the first time I hear of it in this way.
I've had something similar a few times, but with ads I placed to sell a bike or something. Someone would contact me and tell me they want the item and will pay more if I can ship it to them. Which is not a very unreasonable request. But then, same thing happened. They send a cheque, with an amount way too high and ask to return the rest...
I think I've had this three times now. And I live in Ireland, which is not that huge...so I guess people pulling these kinds of scams are everywhere.