Where can i buy a working projector for under $100?

Question

please don't say ebay

Answer 1

1: go to amazon.com

2: type in 'projector'

3: click 'Go"

there's an  

Atdec TH-WH-PJ-FM Telehook Universal Projector Flush Mount by Atdec for just $60 at no.8 on the list

Answer 2

On the assumption you mean digital front projector (not a film or slide projector -- which shouldn't be difficult at any old equipment store) you might find an old CRT model (which can be good under certain conditions, but are huge and heavy), or a basic and old SD resolution business model, but nothing at all of decent calibre.

Projector lamps alone cost $300+.