YES THEY DO
At least they do around here. As a matter of fact, they don't use paper bags, but there's these new covers you can buy that are solid colors and seem to be made of a fabric (lycra I think).
I used to cover my books in the comics section of the newspaper...i'd recover it every week or so for the new comics. I loved it though cuz when i was bored I could just keep reading the cover of my book!
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