Donate every time you use Amazon!
Amazon has set up a system where you can be donating to Marshall Elementary School with every Amazon purchase you make. When I go to this site, I visit www.amazonsmile.com.
You can click this link to set your charity to Marshall Elementary:
Here's the link: http://smile.amazon.com/ch/54-2173518
Once you've set it up, you simply have to remember to go to www.amazonsmile.com instead of www.amazon.com. If you go to the normal Amazon site, the money will not go to Marshall. It took me a while to get into the habit, but now I have trained myself to go to the Smile site :)