About 10 years ago, when I started looking into making parts for Revere Ware cookware that I couldn’t find elsewhere, I built up quite a collection of pieces to use as samples and to test the fit of the new parts. At the time, my wife and I loved going to thrift stores, which turned out to be a great source of Revere Ware (and Pyrex and other neat vintage cookware pieces). I think in all we ended up with about 80 or so pieces, all bought on the very cheap.
While they appear to be getting somewhat rarer (possibly because buying stuff from thrift stores to resell on eBay has become a popular activity), I still do see some good finds to be had when I visit thrift stores for used children’s books (those care free days are over, for now).
The point is, if you are resourceful, there are lots of other more local places to get Revere Ware that are cheaper than eBay (where you can find most anything admittedly) and won’t cost you to ship.
In addition to thrift stores, sometimes entire sets are sold on Craigslist, like this one.
I’ve looked at a lot of sets for sale on eBay; let me tell you, that is a great deal.
So, if you are looking at replacing some Revere Ware, or building a collection, consider your local sources. Many towns have thrift stores, secondhand stores, or stores that specifically consign items like cookware. Also, setting up a Craigslist RSS feed that you can check occasionally in an RSS reader is pretty easy. You may be surprised what you find, and you may just find a wonderful rare piece, or find what you need on the cheap.