ASUS M2N61-AR (HP) Skt AM2 mobo TESTED

Mobo is tested and working and comes with adapter to connect the tiny 20 pin power connecter to a standard connecter.  MMobo is tested and working.  It comes with rear IO shield and USB WiFi adapter.  

The board's form factor is ITX and it has 1 PCIE x16 socket and 1 PCI socket as well as 2 DDR2 sockets.  I don't know why, but these boards are comanding a high price.  If you want or need this board I'm selling it for $50 plus shipping.  I've seen it ranging from $50.00-$100.00

What are guidelines for selling, now that I've listed something?