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Amazon currently has a nice promotion where it’s offering $5 off when you spend $20 on a huge selection of books of all genres and prices, including the vast majority which are already discounted. There are plenty of sci-fi and fantasy books in the selection as well as many Dungeons and Dragons manuals. Just be sure to use the search field on top of the promotion or the menu on the left of select the category you’re interested in.

[Save $5 when you spend $20 on Books!]