Lloyd - check out the boneyards. I put a set of 15x7's on my 1970 Catalina so that I could run wider tires and they only cost $5/each. Mine came off a full-size wagon (1977-198?), but the wagons run a 5" bolt circle and I'm sure you're aware that you need 4 3/4" circle. You might try to find a set off a Caprice cop car. They are 7" vs. the 6" that those cars normally run and are the correct bolt circle. It might take some checking, but $5/wheel vs. $100/wheel is worth the effort.
You may also want to check with some tire stores. Years back they always had steel wheels in stock and might be able to order them through their supplier. The wheels are typically built by the same company that supplies them as OE to GM.
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