AudiobookStand (Brilliance Audio) is closing their store, and offering many audiobooks for $4 each, with free shipping. Good chance to get your hands on physical copies, if you're into that. Some other books are also on sale, $6 and up.
The Martian [audiobookstand.com]
by Andy Weir
Jurassic Park [audiobookstand.com]
by Michael Crichton
The Darwin Variant [audiobookstand.com]
by Kenneth Johnson
Feel free to add more notable deals!