Team Fortress 2
Counter-Strike: Global Offensive
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Sale 1: Sale on August 30th for $138.89: https://marketplace.tf/items/tf2/790;6
Key prices on August 30th (1.82): https://marketplace.tf/items/tf2/5021;6 ~5730 keys sold at $1.82.
138.89 / 1.82 = ~76.3 round to 76.
Sale 2: Sale on SCM for $125.71 at 8PM July 25th: https://steamcommunity.com/market/listings/440/What%27s%20in%20the%20Sandvich%20Box%3F
Key prices on 8PM July 25th: https://steamcommunity.com/market/listings/440/Mann%20Co.%20Supply%20Crate%20Key 34802 keys sold at $2.52
125.71 / 2.52 = ~49.8 round to 50 keys.
Sale 3: https://backpack.tf/profiles/76561198071520036#!/compare/1564704000/1564876800
Not including, it's bulk. Could be used to price the Cat Hat though.