This is definitely too high, and way outdated. KaW + Robo hat, I cant see anyone paying 2 buds for this.

http://www.tf2outpost.com/trade/21312881

Rather young trade at 1.6 Buds

http://www.tf2outpost.com/trade/21295025

Another young trade at 1.6

http://www.tf2outpost.com/trade/21102428

1:1 with an Aces High Dead Cone (1-1.3 Buds, 1 Bud after overpay)

http://www.tf2outpost.com/trade/20469854

1:1 with a KaW Titanium Tyrolean (outdated price)

http://www.tf2outpost.com/trade/20402807

Offered on a Dead Presidents Jumper's Jeepcap (No price)

http://www.tf2outpost.com/trade/20833949

Offered on (and sold for) Pro KS Australium Wrench

http://steamcommunity.com/market/listings/440/Strange%20Professional%20Killstreak%20Australium%20Wrench

Last one sold for 90$, which comes out to ~1.6 buds (30.8 Keys)

The same wrench was also sold for 30 Keys pure here: http://www.tf2outpost.com/trade/20167389

So, only found two sales, both quite a bit below the current range, and even though the two 1.6 trades are young, the fact that there are two does show that the 1.8-2.1 range is too high. As always, if I missed anything or messed up, say so in the comments.