Sale 1:

Sold for an Ooze Ol' Snaggletooth and 2.5 keys of sweets

(49 + 2.5)*0.9 = 46.25 rounding to 46 keys

http://www.tf2outpost.com/trade/25748377

http://backpack.tf/profiles/76561198032173237?time=1430031600 (April 26th)

http://backpack.tf/profiles/76561198032173237?time=1430204400 (April 28th)

Sale 2: (outlier, outpost banned)

Sold for 47 keys + 1 key of sweets

47 + (1*0.9) = 47.9 rounding to 48 keys

http://www.tf2outpost.com/trade/25722910

http://backpack.tf/profiles/76561198046501307?time=1429254000 (April 17th)

http://backpack.tf/profiles/76561198046501307?time=1429340400 (April 18th)

Notes:

Mini for the Ooze Ol' Snaggletooth: ~49

Sold with 4 keys for a Disco Beat Down Dr's Dapper Topper and a Prof. Australium Grenade Launcher

(30 + 29)*0.9 - 4 = 49.1 rounding to 49 keys

http://www.tf2outpost.com/trade/25707639

http://backpack.tf/profiles/76561198122556509?time=1429167600 (April 16th)

http://backpack.tf/profiles/76561198122556509?time=1429426800 (April 19th)

Mini Mini for the Prof. Australium Grenade: ~29

1 sold on the SCM for $70.00 on the day of the sale

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Grenade%20Launcher

(70/2.4) = 29.1666667 rounding to 29 keys

Conclusion:

Sales at 46 an 48, taking the final range at 46 to 48 :)