</font><font color="blue" class="small">( in each case they wanted to send me a cashiers check for about DOUBLE the asking price of the tractor, but then wanted me to wire transfer the excess to a 3rd party that would come to get the tractor. )</font>
The cashier's check scam! Here's how it works.
You sit on the cashier's check until your bank clears it and pays you, then you send off the rest of the money. Two weeks later, after the paper wends its way through the morass of international banking, the check bounces, and your bank debits your account. The money you sent on is, of course still gone and unrecoverable.
This scam works because Federal law prohibits your bank from sitting on cashiers checks for more than a few days. That helps in domestic cases, because your bank doesn't get to rip you off, but it opens you up for international fraud.
Any time you're dealing with international funds transfers from people you don't trust in advance, talk with your banker. There's snakes in the tall-grass.
There's a better description of this on
http://www.snopes.com the source of information on urban legends and scame.