(Disclosure: This site contains product affiliate links. We may receive a commission if you make a purchase after clicking on one of these links. Read our affiliate disclosure for more info.)
IndieGameStand has a pay what you want deal up for Steel Storm: Complete Edition.
Minimum price is price is $0.25. Pay $1 or more and you also get a Steam activation key.
Beat the average and you also get the Steel Storm: Forgotten Prison DLC.