This deal has ended.
PlumDistrict.com offers $13 for Two-Month Subscription to BookPig.com, normally $26. Better still, code funfun drops the price to $11.70. BookPig.com offers a book rental service for children (similar to what Netflix does for movies), eliminating the need to buy expensive books or go to the library. Click the above link to buy your voucher, then go here to make your subscription purchase. Be sure to read the "Fine Print" on the deal page so there are no surprises, but highlights include: voucher may not be combined with any other offers or promotions, and it expires 1/15/12.