Not that I can do any online shopping right at the moment, since my house is outside of the time/space continuum, but when I do I can take a second to check if maybe my purchase wouldn't help a charitable organization ever so slightly.
Pretty simple. Make your way to the site through Goodsearch specifically and part of your purchase is donated. No extra charge, very little extra time, and just about any charity you can think of it included. Good plan.