Most folks say that fitting bonded glass is one of the few jobs on a car that really is best left to the professionals. If you do all the preparation yourself (that's the time consuming part), then a professional glass fitter might give you a good price for cash and will already have all the right primers, adhesives and sealants.
Buying the glass from a breaker is definitely the way forward; I'd expect an OEM one would cost silly money.
I've never tried it, though I've done a few of the old fashioned type. In your position, I'd probably have a go too; the rear quarterlight is just the right size to cut your teeth on. Watch as many videos as you can find, and buy a good quality adhesive/sealant. If you possibly can, get a pair of those handles with rubber suckers for handling the glass; I expect it would make the job much easier. If you were a bit nearer, I'd lend you mine.
Good luck, and do let us know how you get on.