2 Month Old Price || 4 in existence

3 out of the 4 are locked in collector's backpacks and haven't been traded in months:

http://backpack.tf/id/kingofhats

http://backpack.tf/profiles/76561198046616480

http://backpack.tf/id/garryyy

4th one is currently for sale: http://www.tf2outpost.com/trade/10014018

Offered 2 buds and owner added him.

http://www.tf2outpost.com/trade/9988465 - previous owner wanted 2 buds

http://www.tf2outpost.com/trade/9922124 - previous previous owner wanted 2 buds

tl;dr 2 buds is a common buyout. One is about to sell for 2 buds and was most likely sold for less or used to trade for another unusual in the past since most people do not resell unusuals for what they paid for them therefore I included a lower bottom end.