One mission for $20? Also I thought Ground zeroes and phantom pain were one and the same? Ground zeroes -> Phantom Pain -> MGS V: Phantom Pain
Ground Zeroes is the precursor mission to Phantom Pain. Think of it as how MGS 2 was set up in a way, only picture the plant chapter being a full game on it's own. I've found you usually get a good bang for your buck with MGS games, so it being one mission means that mission will probably be at least a few hours. PW released at $20 and that game is decently long, I wouldn't not buy it based on it saying it's only one mission
Wolf Among Us Season Pass (Episode 1-5) $20
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$6.66
1. Emoney244
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$3.33
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FYI this doesn't include episode 1 which will most likely be required to play the other episodes