I've seen some used 8.20x15 w/w piecrust Firestones on E-bay and they went for around $500. I have a set but they are not for sale...yet, got them in a trade.
I think most of the "vintage" type slicks offered today are Cokers repops of the original Firestones and they run from about $280(8.20x15) up. Least expensive I've seen retail was $255 per tire on a "special" from Coys speed shop in Denver a couple months ago.
Keep searching like e-bay or racing junk or such because they do show up there once in awhile. Good Luck and if you find a decent price let everyone know
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