Safeway gives I think a $.05 credit a bag, I think. OR maybe $.06. I forget. Anyhow, I never have to ask. So does Foodland (most days), my commissary (some days), and I hear tell that Long's the drugstore does too, but I never shop there almost. We have a few bags from everywhere. They're cheaper at a lot of places than making my own (plus they're all made out of recycled materials, too!) They do kind of stink, tho.
I heard that Home Depot might start soon, too. I know they all of a sudden have reusable bags for sale (though theirs are a little more expensive--BUT you can clip them to your cart!)

I love the feeling I get when we use those bags. I had a $242.00 grocery bill yesterday (for 3 adult males, a 50-lb dog, and lil' old me-- a whole freaking cart-full! Yay stock-up day!) and I only had to use ONE plastic bag. I LOVE getting home, unpacking everything, and not having a BILLION stupid plastic bags floating around my living room for my puppy to shred into bits before I stop him.