All right, 4 months old price

http://backpack.tf/classifieds/search/363/5/33 - one 20 key seller

http://www.tf2outpost.com/trade/10463728

Sold for 21 keys

* G. Confetti Ushanka (20–25 keys)

http://www.tf2outpost.com/trade/10222673

* 20 keys, retracted (bought above)

http://www.tf2outpost.com/trade/10437746

Sold (with Beak), wanted 18 keys

http://www.tf2outpost.com/trade/9959856

* 19 keys + 2 genuines

* Smoking Buckaroos (too low to look up)

* Smoking Hard Counter (too low to look up) + 1 key

http://www.tf2outpost.com/trade/1716744 - Boy that's an old trade

B/O 1 bud

* S.S Ze goggles (20–24 keys) - retracted

http://www.tf2outpost.com/trade/5357745 - Another old trade

B/O 1 bud

* steaming stout shako (17–21 keys)

http://www.tf2outpost.com/trade/10794665

B/O 1 bud - Fresh trade

http://www.tf2outpost.com/trade/10713798

Sold for 19 keys

http://www.tf2outpost.com/trade/8845925

B/O 20 keys

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Lower price because of one successful sale

Upper price because of one selling at 20 keys, and one offer of 20 keys (also g fetti ushanka offer).

Yes, I know there is one 21 key sale, but the buyer also offered 20 keys on another, so he really wanted one. Also, the 20 key sale has not been sold, so it's kinda weird to make the upper 21 keys then.