Each individual game costs $0.50. When buying 5 or more games you will get bonus discount. You can also buy Grab Bag (random Steam key) in this bundle.
Get DayZ, Arma 3 + few DLCs, and more Bohemia Interactive games for €26.00 / $30.00.
Get Gang Beasts, Full Throttle Remastered, Headlander and more Double Fine games for $9.00 / 8.00€.
Get Hob, Ancestors Legacy, American Fugitive and 3 more games for $3.99 / 4.09€.