Lighting on Ebay

maybe

goodmart.com sells that ballast & capacitor for $81.83, so a $50 Buy It Now price is great. ( They also sell lamps for that for $23.75.)

The cons:

The lamps seem to all be 4000 K color temp, which is a bit yellow for projection.

The lamps are all enormous, so you will need a big mixing bowl reflector & a big box to house your projector.

1000 Watts is a lot of power for a DIY projector. Most builders don't go above 400 Watts. You would need to pay special attention to cooling, and be prepared to pay some hefty electric bills.

The pros:

A mighty bright image, even if you make it super-sized.