As part of Amazon’s monthly deal of 100 Kindle ebooks for $3.99 or less, sci-fi master Robert A. Heinlein‘s The Door Into Summer is on sale for only $2.99.

Originally serialized in The Magazine of Fantasy and Science Fiction and published in hardcover in 1957, The Door Into Summer follows Daniel Boone Davis, a businessman in 1970 who gets screwed over six ways to Sunday by his partner and his girl and decides to take a 30-year cold nap in suspended animation. His plan to exact his revenge later on doesn’t quite work out so well, but that’s okay because there’s time travel. Time travel, people!! Gotta love Heinlein’s brilliance. I wonder if he imagined bad 70’s hair, too.

Check out the main sale page for the other 99 Kindle titles on sale for $3.99 or less for the month. You’d better hurry, though, because February’s a short month!

If you’d like a physical copy of The Door Into Summer, the paperback edition is on sale for $7.99 and is part of Amazon 4-for-3 promotion, where you can purchase four select books for the price of three.

NOTE – you don’t actually need a Kindle device to read these ebooks. Books can be read on a Kindle or one of Amazon’s free reading apps for iPhone, iPad, Android, Windows PC, Mac, Blackberry, and Windows Phone 7. Also, you can gift Kindle books and set your gift to be delivered whenever you want to anyone with an email address.