If you buy 3 games, you get an 80% discount, 4 is 83%, and 5 gives you an 85% discount on the entire order.

You can get the newest games (Game of Thrones and Borderlands) and then add the 3 cheapest games (Poker night 1 and 2 and Puzzle Agent) making it just 10.49.

I already had Borderlands and TWAU, so I picked up the new Game of Thrones + the four cheapest games (Puzzle Agent, Poker night 1 and 2, and TWD: 400 days for 7.49 total.