You can get your slide mounts now.
Get on eBay and see what 6x6 projectors are/have been selling.
Then research the projectors for the bulb it uses, and if those bulbs are available.
And note the features of the various projectors.
What else do you want in a projector?
- loading, manual (you load one slide at a time) or automatic loading (via a tray)
- focus, manual or auto focus
- remote control?
Glass mounts can be tricky in an autofocus projector, since the projector will try to focus on the glass rather than the film.
On my 35mm autofocus projector, I just manually refocused the projector ... problem solved.
It took me MANY months to get my 6x6 projector, and bulb availability was one criteria.