Hope this is my final re-suggestion.

Sale #1:

Sold with ~2 keys sweets for a TF Logo Data Light + Harvest Moon Buckaroos

Can't use as I'm unable to locate a suitable mini for the Buckaroos

http://backpack.tf/profiles/76561198087007001?time=1428615879

http://backpack.tf/profiles/76561198087007001?time=1428649200

Sale #2:

Sold 1:1 for an Electrostatic Crones

170 * 0.9 = 153 keys

B/O at 110 keys, capping value

http://backpack.tf/profiles/76561198089388084?time=1426921200

http://backpack.tf/profiles/76561198089388084?time=1427007600

Sale #3:

Sold with ~2 keys sweets for a Harvest Moon Drill Hat

102 - 2 * 0.9 = 90 keys

http://backpack.tf/profiles/76561198101838829?time=1427612400

http://backpack.tf/profiles/76561198101838829?time=1427785200

Sale #4 (credit to Hanbammer)

Sold 1:1 for a Burning Tyrannus

102 * 0.9 = 91.8 rounding to 92

http://backpack.tf/profiles/76561198089388084?time=1426230000

http://backpack.tf/profiles/76561198089388084?time=1426316400

Sale #5 (credits to Hanbammer)

Sold for a Stormy 13th Spartan + 20 keys

90 * 0.9 + 20 = 101 keys

http://www.tf2outpost.com/trade/25449652

Data Light mini:

http://backpack.tf/vote/id/554955b3b88d88c6668b4579

Leave your field to flower!