Toy Lab, a toy company in Cincinnati, Ohio, accepts used toys, including action figures, dolls, cars and other plastic toys, for recycling. Toys may be dropped off at their facility or delivered by mail, after which they will be weighed. For every 25 pounds of toys you recycle you will receive a certificate good for a Toy Lab t-shirt.

Here is the link to their website:
http://www.happeninc.com/recycle/index.html