New windows for the 69-73 4-door Sedan & Wagon are not available. Some glass shop may have one collecting dust but they are not being made at this time.
When I first started on my car my friend spotted one (tinted) on eBay for a lot less and contacted the seller about clear ones, he had a bunch, we cleaned him out. At the end of the day I think we got 6-8 of them for different people we knew were looking for them. We do not have any spares for ourselves or others.