I failed to locate any replacement blades at the stores I checked in town. I wanted to buy Bosch blades but those fools don't sell online and nobody in town carried Bosch or anything else that would fit the G6. It's a shame, I really like the design of the G6 blades, they are a piece of cake to replace, but no one seems to carry them. I think the new Malibu uses the same design so hopefully GM will spread the design across their other cars so that in time the blades will be very common.
I finally got the blades replaced when I took my car in for service at Firestone and they just happened to have something that would work. They wanted $80 for them and I just laughed. I managed to talk them into giving me the blades free since I had a lot of maintenance work done.