Lower end can probably rise a bit on this, it's quite easy to get offers of around a bud. High end seems fine, it's the highest that people are offering.

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http://www.tf2outpost.com/trade/6794886 - 1 month

B/O: None set

Sold: No

Offers:

- 1 bud + Kringle

Offer value: 29 keys

- O. Fire Officer's Ushanka (25 - 32 keys

Offer value: 26 keys

Best offer: 29 keys

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http://www.tf2outpost.com/trade/7248078 - 3 weeks

B/O: 1.33 buds

Sold: No

Offers:

- 1 bud + S. Widowmaker

Offer value: 30 keys

- 1 bud

Offer value: 27 keys

Best offer: 30 keys

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http://www.tf2outpost.com/trade/7344571 - 3 weeks

B/O: 36 keys

Sold: No

Offers:

- 1 bud

Offer value: 27 keys

Best offer: 27 keys

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Conclusion: Seems like the current price only needs a small adjustment, even after 5 months. 25 - 30 is a round range that more accurately reflects the offers on Outpost.