Sale #1: 2.7 + 2.4 = 5.1 * 0.9 = 4.6 buds (Thank you MaGenta)

http://www.tf2outpost.com/trade/24764425

Sold for a Pro Aussie Stick Launcher + Power Surge Rebel Rouser

Backpack before (Buyer): http://backpack.tf/profiles/76561198074890690?time=1422691200#

Backpack after (Buyer): http://backpack.tf/profiles/76561198074890690?time=1422777600

Sale #2: 4 * 0.9 = 3.6 buds (Thank you Aaron)

http://www.tf2outpost.com/trade/25092023

Sold for a duped PE Chieftains Challenge

Backpack before: http://backpack.tf/profiles/76561198120382814?time=1424246400

Backpack after: http://backpack.tf/profiles/76561198120382814?time=1424217538

Sale #3: 5.7 * 0.9 = ~5.1 buds

http://www.tf2outpost.com/trade/25087618

Sold for a Specialized KS Australium Rocket Launcher

Backpack before: http://backpack.tf/profiles/76561198074890690?time=1423987200

Backpack after: http://backpack.tf/profiles/76561198074890690?time=1424129175

Mini for Sticky Launcher: 2.7 buds (Thank you MaGenta)

http://puu.sh/fOFo3/c29bc9fecb.jpg average price is ~$90, ~2.7 buds

Mini for the Duped Chieftains: 4 buds

http://www.tf2outpost.com/trade/25187602 - B/O of 4

It was relisted multiple times, this being the eldest of the bunch with the constant 4 bud B/O: http://www.tf2outpost.com/trade/25151537

Mini for Rocket Launcher: 5.7 buds

http://steamcommunity.com/market/listings/440/Strange%20Specialized%20Killstreak%20Australium%20Rocket%20Launcher

Current, ungifted seller wants $171.35 for it.

171 / 2.49 = ~68 keys / 12 = 5.7