Fair price for 8-1/4 rear end

If you are not set on originality, there are alternatives. A Ford 8 inch axle was available in Mavericks/Comets, Falcons and some Mustangs. The bolt pattern is the same but the center register is smaller.
Also, the 8 1/4 Chrysler axle can be found in Jeep Cherokees. They used coil springs so there is some cutting and welding required.