A couple of threads lately have talked about how to find/wash reusable tote bags to use at grocery stores, retailers, etc. and I think that's FABULOUS on everyone's part, I've been doing it for years. Nowadays they're darn cheap, too, and available everywhere.
For me, the problem is not finding them, but USING them. Whole Foods, Trader Joe's, and one local market are the only places I have found that using these bags is easy and convenient. Most of the large grocery stores in my area have the bagging station right by the checkout, and they have no easy way for the cashiers to pack things in my reusable bags. I usually tell them I'm happy to pack things myself, but at some checkouts there isn't really anyplace to put the stuff where I can get to it! . Walmart and other stores that have the carousel-type bagging stations are the worst. It irks me to no end that they have reusable bags for sale for 99 cents, right in front of the checkout, and still make it so inconvenient for everyone to use them.
I hope my neck of the woods is the exception, not the norm.