Which store?
I've had good results with Anco blades.
Christopher A. Young Learn more about Jesus
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I recently had some Bosch blades that starting chattering. I went back to the auto parts store where I bought them and said to the guy "My Bosch blades are chattering. I honestly don't remember when I bought them, but I'm pretty sure it's been less than a year. Do you think they're just worn out?"
We went outside, he listened to them chatter, grabbed me a new pair and installed them for me. No receipt, no paperwork, nothing.
When I offered to tip him he said "Don't worry about it. You were honest and you were a nice guy with no bitching like we get from a lot of people. Have a nice day."
They'll be getting my business in the future.