Babble is a scam
This is the same scam that con artists have been doing with cars for years. They offer to send you a check more than what the car (or expensive appliance in this case) is worth. You get the check and cash it, and send the "extra" to some other con artist (or the same guy at a different address). Then a few days later your bank tells you the check is no good. Scam.
Folks, get a certified check, validate it with your bank, and cash out the funds before you ship anything to anyone. ANyone asking to send you more than the purchase price so that you can then send funds to someone else (which is just a preposterous thing anyway you look at it) is running a scam.