I was in Kmart tonight and it looks like they are clearing out Windex wiper blades, and replacing them with Diehard branded standard blades. The Windex Balance are a higher quality blade that I've been using for a while and they work well. Diehard standard look like a low quality blade.
Clearance prices are below $10 and there was pretty good stock of the lesser used sizes in the store. I cleaned out the sizes I need. The online prices look a dollar or two higher than in-store, at least for me.