But even if you missed the auction, there's still a chance to help. Some authors and publishers are still donating book proceeds to the Russian LGBT Network and Rainbow Railroad (most of these offers end by May 31st, so now's a good time to make your purchases if you're interested!) Follow this link to see a list.
I'm going to particularly call your attention to Ultimate Wired Hard, published by Circlet Press. This book is huge! Forty-three stories for less than $6. It's an amazing deal even before you consider that all the proceeds are going to charity. If you're interested in making sure the largest possible donation gets made, buy the book from Circlet's website—the charities will get a bigger cut.
I'm amazed and inspired by the work going into this effort, and I invite you to support this project, if you're able.