Counter requested by Foamy, every sale provided here is credits to Sugarcube and/or Foamy.

Sales below are credit of Sugarcube:

Sale 1

http://www.tf2outpost.com/trade/27752731 Sold for PE Tyrolean + Bubbling Trophy

B/O for Tyrol was 100

X = 100 + 15

X = 115

Trophy http://backpack.tf/item/1391398623

Tyrol http://backpack.tf/item/323864768

Buto http://backpack.tf/item/3564534996

Trade http://backpack.tf/profiles/76561198125791160?time=1454054400&compare=1454140800

Mini for Tyrol

http://www.tf2outpost.com/trade/27738874 B/O of 100, using 100. Current suggestion is higher than 100

Sale 2

http://backpack.tf/profiles/76561198090308403/#!/compare/1454572800/1454659200 Bulk for Strange Puzzle Prehistoric

Sale 3 LOW

http://www.tf2outpost.com/trade/27807375 Sold quickly with 11.3 keys for Pro KS Aussie Eyelander + Max + GE Sola

X + 11 = 45 + 30 + 26

X + 11 = 101

X = 90

Sola http://backpack.tf/item/950531041

Max http://backpack.tf/item/1279873752

Eyelander http://backpack.tf/item/3621215351

Kabuto http://backpack.tf/item/3752945159

Trade http://backpack.tf/profiles/76561198170706982/#!/compare/1454745600/1454832000

Seller

http://www.tf2outpost.com/trade/27786334 105 keys

Sales and info below are credit of Foamy:

Sold + HG attendant for grail skullcracker (~167)

http://backpack.tf/profiles/76561198028943046/#!/compare/1456819200/1456905600

attendant is outdated, but this will be no more than 100 I guess

Sold for eerie bomber + sweets (~5)

http://backpack.tf/profiles/76561198061224037/#!/compare/1456560000/1456819200

Was used in the bomber sugg (using 90-115 for this), and the other sale there definitely backs up lower values here

Bulk-qsed, not usable

http://backpack.tf/profiles/76561198017866818/#!/compare/1453190400/1453276800

In short, 90 was never an outlier. 90-115 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.