9 months old price... Range of 28-32 based on 4 sales in the last month and current offers on the only non-gifted one currently on the market.

Actual Sales:

28 keys: http://www.tf2outpost.com/trade/9384907

30 keys - http://www.tf2outpost.com/trade/9066147 (sold for 1 buds + 2 keys) - buds were 28 at the time

35 keys in unusuals - http://www.tf2outpost.com/trade/9628350 - sold for steaming hotrod

36 keys in unusuals - http://www.tf2outpost.com/trade/9117693 - unclear what it sold for but best offer of planets vrh + 5 keys

Current Trades:

http://www.tf2outpost.com/trade/9559951

Offers:

35 keys in unusuals: steaming hotrod

33 keys in unusuals: steaming HWNN + 2 keys-ish?

27 keys pure - rejected (buds were 27 at the time this was offered)

Conclusion:

Lowest documented price that it has sold for is 28 keys (low end). Highest documented price that it has sold for is 32 keys (accounting for unusual overpay). Of note, even the gifted one has sold for a buds before when the value of buds was 28.