If you're cheap, you can get Peter Watts' Blindsight for free at his
website.
Max Gladstone's Craft Sequence is one of the series up for the series Hugo award, so if you're a Hugo Award voter, and you don't have any of the series, it might be worth it to pick up the omnibus for $12, pick up the the individual ones you don't have for $2.99, or pre-order the next in the series for $2.99, or you can hope that some or all of them will be in the Hugo packet. I'm not sure if they're just on sale again or if they've been on sale since 2/7, when I bought the one I don't have, and preordered the one due out in September.