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When you get enough points you can exchange them for lots of different items. My favorite are the magazine subscriptions which only cost 100-150 points. You can easily obtain 100 points by doing just a few tasks. Everything is free, you just have to spend some time reading and learning about different ways to recycle and help the environment. So far I got subscription to Good Housekeeping which has high value coupons in it.
Follow this blog by selecting an option on the left to get the latest deal information as soon as possible before they run out or expire :).