I sat here a moment trying to decide what I would do in similar circumstances.
The project seems rather more in the realm of business hardware than the average PCW will stock.
So the thoughts roll on and office equipment outlets might have a better range of projectors....
......But... a major branch of PCW might give you some individual attention if you were suggesting a job lot to them!
I assume that a duplex laser printer could be yours for < £500 and that might save something extra for the projector.