Oh and there are often coupons for promotions that are like $2 per month for 3 months. You can just cancel your current plan and reactivate under the coupon.
I had audible and wasn't using it much. I went to cancel, and when I did, they offered up a couple different discounts/offers to try to keep me. They offered one that was something like $15/year and that's it... I could keep the credits I already had, but I wouldn't get the free monthly credits. I decided on that plan since I would probably only do a couple books a year (for trips) and I didn't want to pay monthly!