Sellers:

http://imgur.com/a/9jm9k

https://backpack.tf/item/3656842979 - b/o: 117 keys

http://www.tf2outpost.com/trade/28696386 - b/o: 205 keys (3 months)

http://www.tf2outpost.com/trade/28802008 - b/o: 110 keys (1 month)

http://www.tf2outpost.com/trade/28831735 - b/o: 200 keys (3 weeks)

Sold:

http://www.tf2outpost.com/trade/28648809

http://backpack.tf/profiles/76561197961781560#!/compare/1488931200/1489017600 - sold for Disco Beat Down Cotton Head + Strange Professional Killstreak Australium Rocket Launcher = 163 keys

Mini's:

Disco Beat Down Cotton Head:

http://backpack.tf/profiles/76561198263385646#!/compare/1490140800/1490313600 - sold for Burning Flames Noble Nickel Amassment of Hats = 121 keys

Classifieds: http://backpack.tf/classifieds?item=Cotton%20Head&quality=5&tradable=1&craftable=1&australium=-1&particle=62

Screenshot(s) of Classifieds:

http://imgur.com/8iJOOxU

<Sellers>

100 keys | http://backpack.tf/item/5010156860 | http://backpack.tf/u/76561198080179568 | Listed 10 days ago [Bumped]

105 keys | http://backpack.tf/item/2793150159 | http://backpack.tf/u/76561198014055677 | Listed 4 days ago [Bumped]

taking 100-121 keys