I'm pretty sure it doesn't get any cheaper than this. Steam is currently selling the game at $4.99 with 75%.
About the Game
The Ship is primarily a multiplayer, online murder game with a unique set of game rules.
The Ship is owned by the mysterious Mr X and as one of many 'lucky' recipients of a free ticket you arrive on board The Ship to find there's a catch to your luxury cruise.
You are coerced into a brutal Hunt to indulge Mr. X's fantasies, under threat of death for not only yourself, but also your family. Your only chance to save yourself and your family is to play the Hunt and win.
Purchase The Ship and receive two extra activations to send to your friends! Check your inventory after activating the key to find two giftable copies.
Edit: Thanks to hermano and kamoi who pointed this out- the people you gift it to also receive an extra copy of the game to gift to someone else. So essentially it is 5 copies for $1USD (although you get 3).
In the spirit of ozbargain, I am will to accept a gifted copy of this game.