I think this is a trend that is starting to pick-up (or at least I hope it is) — stores offering discounts or incentives when you donate used goods.
Two major retailers offering a good program:
Kiehls
Bring in an empty used container from their products to recycle and receive free new products in return. The more you bring in the larger your gift becomes. Bring in 3 empty containers and get a tube of lip gloss, or bring it 10 containers and you get to pick out any product (less that $25) for free.
http://www.kiehls.com/us/en/home/index.aspx http://www.7x7.com/blogs/glamwatch/waste-not-want-not-kiehl-s-store-recycling
Timberland Shoes
Visit a Timberland store to donate a used pair of shoes and you'll get 10% off a new pair of Timberlands. Timberland is partnering with Soles4Souls, who donates shoes to those who need them.
http://www.soles4souls.org/news/2009/04-20/timberland-and-soles4souls-launch-nationwide-shoe-donation-program
