Use your promo code at checkout to get a free used book (valued at $7 or less) every time you buy four or more used books. That applies for every set of four used books that is purchased:
Buy… | Get… |
4 used books | 1 used book free |
8 used books | 2 used books free |
12 used books | 3 used books free |
16 used books | 4 used books free |
20 used books | 5 used books free |
Used book value up to $7