Is there a website that lets you trade your conventional books for electronic versions (for your Kindle?)?

I would love to have little possessions and own a Kindle instead of four FULL bookshelves. I can’t stand the clutter, but I’ve spent so much on books that I HATE the idea of receiving no compensation (even if it’s greatly tilted towards the merchant.) Is there a book trading website that would take my conventional books and credit me towards electronic reader books?