http://www.tf2outpost.com/trade/9255841 - C/O's black Bills, gold Bills+ 1 key, 9 keys

http://www.tf2outpost.com/trade/9239931 - C/O 9 keys

http://www.tf2outpost.com/trade/9248711 - C/O's 9 keys, 10-11 keys worth of items

http://www.tf2outpost.com/trade/9252890 - C/O 10 keys

http://www.tf2outpost.com/trade/9245853 - C/O 9 keys+1 ref

http://www.tf2outpost.com/trade/9258393 - Selling for 10 keys each

http://www.tf2outpost.com/trade/9254391 - Selling for 10 keys each, gold Bills+1 key offer declined

http://www.tf2outpost.com/trade/9239977 - C/O's white Bills, 10 keys

http://www.tf2outpost.com/trade/9259748 - Selling for 9 keys

http://www.tf2outpost.com/trade/9248436 - Declined offer of 11 keys+ High Five taunt

http://www.tf2outpost.com/trade/8026273 - Offered 9 keys

http://www.tf2outpost.com/trade/9250080 - Sold two for 10 keys each

http://www.tf2outpost.com/trade/9241880 - C/O's 10 keys, white Bills

http://www.tf2outpost.com/trade/9238226 - Declined 8 keys+sweets

http://www.tf2outpost.com/trade/9247003 - Declined white Bills

http://www.tf2outpost.com/trade/9259542 - Selling for 10 keys each

http://www.tf2outpost.com/trade/9241259 - Sold 2 for 11 keys each

http://www.tf2outpost.com/trade/9252517 - Declined offer of gold Bills

Pretty much everyone knows they are going for around 10 keys now.