7 month old price!

Sale 1:

Sold for 74 USD (74/1.85) = 40 keys

http://www.tf2outpost.com/trade/27573298

http://i.imgur.com/pVn0ad7.png

Sale 2:

Unable to identify sale

[no outpost trade]

http://backpack.tf/profiles/76561197972676539?time=1447315200 (November 12th)

http://backpack.tf/profiles/76561197972676539?time=1447488000 (November 14th)

http://backpack.tf/profiles/76561197972676539?time=1447315200&compare=1447488000

Sale 3:

Involved in a bulk deal

http://backpack.tf/profiles/76561198093234248?time=1449216000 (December 4th)

http://backpack.tf/profiles/76561198093234248?time=1449302400 (December 5th)

http://backpack.tf/profiles/76561198093234248?time=1449216000&compare=1449302400

Notes:

None other on the market, this is the only recent identifiable sale.

Conclusion:

One valid sale at 40 keys. Taking a final flat price of 40 keys.

Feel free to support/counter my suggestion!