Sale #1

http://www.tf2outpost.com/trade/18680495

Sold for 3 buds pure

Backpack of seller

http://backpack.tf/profiles/76561197967726943?time=1399532400 Before

http://backpack.tf/profiles/76561197967726943?time=1399618800 After

Backpack of buyer

http://backpack.tf/profiles/76561197978734843?time=1399446000 Before

http://backpack.tf/profiles/76561197978734843?time=1399656167 After

Total: 3 buds

Sale #2

http://www.tf2outpost.com/trade/20137071

Sold for Strange Killstreak Frying Pan with parts(Without counting killstreak it will be 10.21 keys) + 2 buds + 17 keys

backpack of seller

http://backpack.tf/profiles/76561198080322394?time=1401725754 Before

http://backpack.tf/profiles/76561198080322394?time=1401725754 After

Backpack of buyer

http://backpack.tf/profiles/76561197971392967?time=1401606000 Before

http://backpack.tf/profiles/76561197971392967?time=1401755697 After

Total: ~3.6 buds. However, the seller's b/o is 3 buds. Taking 3 buds as price.

Sale #3(calling this an outlier)

http://www.tf2outpost.com/trade/19656552

Sold for 2 buds + 8 keys + ~7.66 refs in sweets

Backpack of seller

http://backpack.tf/profiles/76561198070765373?time=1399446000 Before

http://backpack.tf/profiles/76561198070765373?time=1399532400 After

Backpack of buyer

http://backpack.tf/profiles/76561198010577274?time=1399532400 Before

http://backpack.tf/profiles/76561198010577274?time=1399621609 After

Total: ~2.4 buds

Sale #4(Calling this an outlier)

http://www.tf2outpost.com/trade/19611193

Sold for 2 buds pure.

Backpack of seller

http://backpack.tf/profiles/76561198032228446?time=1399232437 Before

http://backpack.tf/profiles/76561198032228446?time=1399273200 After

Backpack of buyer

http://backpack.tf/profiles/76561198042535151?time=1399186800 Before

http://backpack.tf/profiles/76561198042535151?time=1399322210 After

Total: 2 buds.

Invalid sales

Sale #4

http://www.tf2outpost.com/trade/19467783

Can't identify the sale

Why not a range? 3 buds sales are the most recent sales and they seem to go pretty fast too. Therefore calling the 2 buds and 2.4 buds sale outliers.