common practice to scam you
If you hear "western union" or certified check to you "over" the amount so you can send the additional payment to their shipper... BEWARE... These guys are easy to pick out... Insist first on talking to these people...Get an address... verify it, call them more than one time to create a dialog. get a reference... and only accept cash or direct wire transfer to your bank and verify that.. Do the above and you're home free. It's not that hard to shake them out of the tree..