Audible.com offers an Audible.com $10 Credit for free. That ties our April mention as the best free Audible.com credit deal we've seen. (We've seen a $10 credit several times before, but only for new Audible members; this one is for everyone.) It's valid only for audio content; it can't be used for purchasing membership or gift cards. The credit expires 60 days after it is issued.