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if you are looking for some that are similar to the factory centers you can check out jc whitney. They have quite a selection and should have some that will work.
You might try e-bay for those but only as a last resort. I needed a couple on my '92 (the centers had fallen out). Was about to start bidding on a set on e-bay when I finally found 2 at a junk yard. I have since noticed that my '92 style are not that hard to find at the yards (don't know about the '88's), especiall the yards further out in the country. If you do the e-bay thing, do your homework. Pay attention to the seller's rating. Charles