Here's how it's done.

SALES:

http://www.tf2outpost.com/trade/25553863 Sold + 1 bud pure (~6 keys at point of sale) for Bubbling TC (Outdated at 37.5, mini at 34)

Presuming offered, 34 - 6 = 28

Histories;

http://www.tf2outpost.com/item/440,3677906206,611,5

http://www.tf2outpost.com/item/440,3653636794,378,5

http://www.tf2outpost.com/trade/25516168 Sold + Blizzy Robo-tyro (Outdated at 21) + TW Napper (Outdated at 38) for RA Mountain Cap (Outdated at 84.5)

- complex, no good, but calculating using current prices gives 25.5. Calling it supporting evidence.

Histories;

http://www.tf2outpost.com/item/440,3673316966,611,5

http://www.tf2outpost.com/item/440,3673316984,248,5

http://www.tf2outpost.com/item/440,3639242877,30045,5

http://www.tf2outpost.com/item/440,3673316991,381,5

http://puu.sh/hh3Js/d0f6a851bc.jpg Current classified seller for 28

TC mini:

http://www.tf2outpost.com/trade/25524524 Quicksold for 26 keys

Lowest B/O is 42 keys, price is probably somewhere between the two.

Using 26-42.

Let it ride.