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Steam has all three current Batman Arkham games and one expansion on sale for $ 4.99 a piece:

1.) Batman Arkham Asylum Game of the Year Edition:

http://store.steampowered.com/app…_204_150_1

2.) Batman Arkham City Game of the Year Edition:

http://store.steampowered.com/app…1_4_4__112

3.) Batman Arkham Origins:

http://store.steampowered.com/app…1_4_4__112

4.) Batman Arkham Origins BlackGate Deluxe Edition:

http://store.steampowered.com/app…_204_150_2