While it's difficult to put an exact dollar amount out there, you would do best to look at eBay and do some comparisons there.
Unfortunately, you need to reflect the quality of that particular projector in the offerrings of current projectors on the market.
That's a 1,000 lumen, 1365x1024, 600:1 contrast ratio projector.
The Epson 1080UB is a 1,600 lumen, 1920x1080, 4000:1 contrast ratio projector.
The Epson costs about $3,000 on the street.
So, an out of warranty, early LCoS technology, unknown condition projector, to others, might get you $1,000 or so. Maybe a bit more. But, search eBay, see if it has sold and for how much in recent months. When I did a search for that model, they were listed for as low as $2,000 and they did NOT sell at that price.
Unfortunately, I think that is a very realistic reflection of the situation. As little as 5 or 6 years ago, projectors easily cost ten times as much as the projectors available today and had quality that is notably inferior to what is currently out there.
I wish you luck!