ebay.
I just got a VPH-1020QM off there for £50.
Spent all week stripping it down, replacing old caps, cleaning and polishing all the innards and lenses, (t-cut is great for bringing shine back to acrylic lenses), i've sanded all the outer casing, primed and sprayed gloss white. It looks great and projects a good image, the best thing is that its totally silent, not a single fan.