I'm certainly no expert on these wagons as far as estimated price. I did run across a thread over on the H.A.M.B. site that has a lot of great info about tri 5 Pontiac wagons. Some of the trim parts from Nomads interchange with the Safari/860/870 wagons and years ago (before reproduction parts were being made) many gave up their good interchangeable parts to fix Nomads because they are more sought after than the Pontiac 2 door wagons.
http://www.jalopyjournal.com/forum/t...models.452703/
I've always wanted a 57 Safari (actually any 2 door 57 hardtop) looks as though I probably won't realize that dream though.