5 month old price.

Currently in the market

http://www.tf2outpost.com/trade/27773796 - 20 key b/o, rejected offer of 15 keys

http://www.tf2outpost.com/trade/27724044 - looking for cs:go keys, rejected same offer as above

http://www.tf2outpost.com/trade/27202837 - looking for offers, 3 month old offer of a batsaber

Sales

http://backpack.tf/profiles/76561198161706318?time=1453881600&compare=1454054400

-Sold for KaW Dappers (19 keys)

http://backpack.tf/profiles/76561198161706318?time=1453536000&compare=1453449600

-Sold for SS Sola Topi (~15) + ~3 keys in sweets = 18

http://backpack.tf/profiles/76561198106520426?time=1452844800&compare=1453363200

-Sold for steaming beret (14) and 5 key in sweets = 19

http://backpack.tf/profiles/76561198101067004?time=1452758400&compare=1452844800

-Sold for SS Baker (19)

http://www.tf2outpost.com/trade/27394754

-Sold for 18 pure

mini for sola topi

bunch in classies for 16

http://www.tf2outpost.com/trade/27751989 - 15 b/o, involved in bulk trade.

mini-mini on beret

http://www.tf2outpost.com/trade/27746232 - offered 14

Honestly though, this isn't really that great of a suggestion by my standards. Feel free to counter-suggest or point out mistakes, and I'll amend to it as I need to do other stuff. Vote based on proof presented, not blindly!