I bought mine off ebay a year or two ago from someone else for around $130-150 shipped I think. It was a resurfaced one with no core exhange needed. They did nice work and it was packaged nicely with that wax paper stuff that keeps it from rusting. I still have the box and can look for the name of the company if you want.
Make sure you get a 5.2l specific neutral balanced flywheel for a 11" diam. clutch disc. when using on a 318 magnum and nv3500 or 4500.