I picked up a Dell S520 interactive projector, with two pens, to demo to a client...and then promptly forgot about returning it until after Thanksgiving, so now I own it. It has less than an hour on the bulb, and a 3 year warranty (not sure if that is transferable). The pen tracking on this thing is amazing (much better than the Epson Brightlinks we had been using), but I could not get it to work with Linux, and this customer made that a requirement. Works great in Windows and OSX.
http://accessories.dell.com/sna/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=210-ABQG
$1600 or best offer.
http://accessories.dell.com/sna/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=210-ABQG
$1600 or best offer.