The Museum Shop Help the The Flight Sim Museum in it's mission by buying your Flight Sim goodies through these links. Books, CD's, videos from Amazon. OK, everybody knows Amazon. They were one of the first and are definitely the biggest.
Bits have a no-frills website but they do have the games.
A good selection and a lot of satisfied customers. Powell's seem to specialise in the sort of books that Aviation and history buffs enjoy. Check out their newsletter too.