Optoma GT1080Darbee 1080P 3D gaming short throw DLP Projector for $529.99 by Newegg on ebay.com
https://www.ebay.com/itm/Optoma-G…SwYwJaCvlU
This is the lowest it has been for a brand new one. The lowest it sold on amazon was for $599.99 with a $15 gift card.