I don't know if you've tried to find windshield wiper blade refills, but it's next to impossible. Everyone wants to sell the whole blade, with the frame. That seems like having to buy a mounted tire and wheel because, well, of course we can't just replace the tire, can we?
Fortunately I found on ebay some 26" strips of rubber insert material the correct size for my blades and can make three sets for less than $6. From Chy-nah, of course, but likely so is the rubber in the $13 blades at the parts store.
Remember when you could go to Western Auto and get a set of wiper refills, and oil filter, a gasket set and rings for a Briggs mower and a replacement Rigid pipe cutter wheel all in one stop?