all outpost sellers are here :

Selling/sold at 3 keys (S = Sold or sold some of his stock):

http://www.tf2outpost.com/trade/9001536 S

http://www.tf2outpost.com/trade/8701790 S

http://www.tf2outpost.com/trade/7315006

http://www.tf2outpost.com/trade/9043586 S

http://www.tf2outpost.com/trade/8902496 S

http://www.tf2outpost.com/trade/7787717

http://www.tf2outpost.com/trade/8974558 S

http://www.tf2outpost.com/trade/8556487

http://www.tf2outpost.com/trade/8491797

http://www.tf2outpost.com/trade/9010771

http://www.tf2outpost.com/trade/8731119 S

http://www.tf2outpost.com/trade/8302396 S

http://www.tf2outpost.com/trade/7950069

http://www.tf2outpost.com/trade/8806937 S

http://www.tf2outpost.com/trade/8588432

http://www.tf2outpost.com/trade/8959098 S

http://www.tf2outpost.com/trade/8219357

http://www.tf2outpost.com/trade/8630135 S

http://www.tf2outpost.com/trade/7142206 S

http://www.tf2outpost.com/trade/8585615

http://www.tf2outpost.com/trade/9053282

http://www.tf2outpost.com/trade/8175795

http://www.tf2outpost.com/trade/9065432

http://www.tf2outpost.com/trade/8312417 S

http://www.tf2outpost.com/trade/9066515

http://www.tf2outpost.com/trade/8590371 S

http://www.tf2outpost.com/trade/8746059

http://www.tf2outpost.com/trade/8129314 S

http://www.tf2outpost.com/trade/9076881

http://www.tf2outpost.com/trade/8878167

http://www.tf2outpost.com/trade/9051854

http://www.tf2outpost.com/trade/9055563

http://www.tf2outpost.com/trade/7991906

http://www.tf2outpost.com/trade/5119166 S

http://www.tf2outpost.com/trade/7683540

http://www.tf2outpost.com/trade/8794662

http://www.tf2outpost.com/trade/9060911

http://www.tf2outpost.com/trade/9043069

http://www.tf2outpost.com/trade/7596207

http://www.tf2outpost.com/trade/8458419

http://www.tf2outpost.com/trade/8534712

http://www.tf2outpost.com/trade/8882320

http://www.tf2outpost.com/trade/8930648

http://www.tf2outpost.com/trade/8885065 S

selling/sold 2.75 = 2 keys + 3 ref

http://www.tf2outpost.com/trade/8129314 S + decline 2.5

http://www.tf2outpost.com/trade/9010646 S

http://www.tf2outpost.com/trade/9016247 S

http://www.tf2outpost.com/trade/8950200 S

http://www.tf2outpost.com/trade/8971018 S

http://www.tf2outpost.com/trade/8962799 S , out of stock

Selling at 2.5 or 2 keys + 2 ref or 10 ref

http://www.tf2outpost.com/trade/9020561 1 left

http://www.tf2outpost.com/trade/8494293 2 left

http://www.tf2outpost.com/trade/7961424 out of stock

http://www.tf2outpost.com/trade/8284769 out of stock

http://www.tf2outpost.com/trade/8719543 1 left

http://www.tf2outpost.com/trade/9064537 3 left

http://www.tf2outpost.com/trade/8914838 out of stock

http://www.tf2outpost.com/trade/4919485 out of stock

http://www.tf2outpost.com/trade/8604021 1 left

http://www.tf2outpost.com/trade/8656992 out of stock

looking for offers

http://www.tf2outpost.com/trade/9073807 accepted 2.25 keys

http://www.tf2outpost.com/trade/8611693 offered white bill's for 3 expanders + ctraft hat = 3 keys each but retrected

Now if you can see most of 2.5 sellers out of stock or few left , also 2.75 same , but 3 keys many unsold and take long time to sell it

i'm not including 3 keys in my range due the fact it's easy to sell 3 keys in Steam market for 6$ and then buy expander + something with 1$ from valve shop