There are like hundreds of these on outpost.

Current buyouts:

http://www.tf2outpost.com/trade/19154948 - 30 (1 month)

http://www.tf2outpost.com/trade/17920991 - 40 (3 months)

http://www.tf2outpost.com/trade/17867509 - 40 (3 months)

http://www.tf2outpost.com/trade/19659727 - 32 (1 week)

http://www.tf2outpost.com/trade/16854769

Aces KE (~9) + Ghosts CK (~12.5) + C9 Tyrant's (~5) + SF Huntsman (~0.5) + 5 pure

~32

http://backpack.tf/profiles/76561197997855531?time=1392105600

http://backpack.tf/profiles/76561197997855531?time=1392278400

http://www.tf2outpost.com/trade/18878073

Sale involved a GE TC, but it's very hard to tell whether it was an actual 1:1 as the original offer was a PE Brown Bomber + Paypal ( http://www.tf2outpost.com/trade/18383936 ), which means that money was probably added on top of either side.

Nevertheless, it had an untaken B/O of 22 for over a month.

Offered on http://www.tf2outpost.com/trade/18316659

Added a G. Fetti Party Phantom and a TF Logo Merryweather (~5) for a GBH TC (~38)

~33

http://backpack.tf/profiles/76561198003240631?time=1393747200

http://backpack.tf/profiles/76561198003240631?time=1393833600

http://www.tf2outpost.com/trade/19052600

quicksold for 18 pure within 3 days

http://www.tf2outpost.com/trade/19138168

http://backpack.tf/profiles/76561198072644359?time=1397458800

http://backpack.tf/profiles/76561198072644359?time=1397631600

Sold for DBD Muffs (~15) + roughly 10 buds' worth of pure (in keys and ref) + ~a bud worth of sweets (after overpay)

Roughly 26 buds.

http://www.tf2outpost.com/trade/16900319

Sold for a duped Scorching Stahl (~16) and a Burning Beak (~12) - 28 buds

http://backpack.tf/profiles/76561198077902582?time=1394780400

http://backpack.tf/profiles/76561198077902582?time=1394694000

*Scorch Stahl:

http://www.tf2outpost.com/trade/18443753 - 18 B/O for 2 months, no success.

http://www.tf2outpost.com/trade/17884713 - Sold for 14.5 pure after a month

http://www.tf2outpost.com/trade/16617310 - Added a G. Fetti Beak (~4) for a C9 Crone's (~20) - 16ish

http://www.tf2outpost.com/trade/19052225

Added 4 pure for a Scorching CM (~18) + DBD Beak (~8)

~22

http://backpack.tf/profiles/76561198060466671?time=1396767600

http://backpack.tf/profiles/76561198060466671?time=1396681200

Valid sales at 22 - 22 - 26 - 28 - 32 - 33, only 22 and 26 being more recent than a month old. Going with polar's advice here.