I had one checker tell me it was "store policy" that he couldn't give me the 5 cent discount per bag on any bag that wasn't one of theirs. Since I use homemade bags this didn't go over very well with me, so the next time I came in I sought out the floor manager and asked. They were stunned that a cashier would tell a customer something like that, and said they would reiterate what the 5 cent discount per bag covered. I've never had that come up again, and I've shopped at that store at least once a week since, although I've never seen that cashier again.
At a different grocery store, a cashier told me that that store had never given a 5 cent per bag discount for bringing in my own bag when I asked about it (and also acted as though I was trying to rip the store off by even suggesting it.) Since it was only one bag I didn't push it, but the next time I came in I went to the cashier I usually went to, and she told me that what I'd been told was wrong, that the store most certainly did give a 5 cent per bag discount.
(I've gotten mostly positive comments on my homemade bags, usually questions as to where I got them or asking if they can be washed in a washing machine, which they can. Makes me wonder if I should go into business.)
