Thanks to a heads up from the amazing Kim Andrews, I'm now aware of Charitocracy's presence on smile.amazon.com. I'll let Amazon explain:
AmazonSmile is a simple and automatic way for you to support your favorite charitable organization every time you shop, at no cost to you. When you shop at smile.amazon.com, you’ll find the exact same low prices, vast selection and convenient shopping experience as Amazon.com, with the added bonus that Amazon will donate a portion of the purchase price to your favorite charitable organization.
So if you shop at Amazon, you can reach it through the smile front door, choose Charitocracy as your charitable cause to support, and then buy what you would normally buy. Or better yet, buy one of EVERYTHING!