This price needs an update. Usually Buyouts means nothing in proofs but this time I think they are really useful:

http://www.tf2outpost.com/trade/8394577 <2 months old trade with 2.3 buds B/O

Offers:

2 buds

2 buds and 3 keys gathering

clean max painted teams spirit + sweets

fetti private eye, fetti cheiftains and some keys (around 2 buds)

http://www.tf2outpost.com/trade/9412499 < a month old trade with 2.2 buds B/O but probably lowered just a few days ago

Offers:

clean yellow max head and pink EA's

2 Buds and 5 keys

Blizzardy Storm Bubble Pipe (2.3-2.8 buds)

http://www.tf2outpost.com/trade/10292657 < a day old trade with 2.8 buds B/O

Offers:

orb tyrolean + $14 (don't knwow which orbiting effect and he doesn't own any unusual)

Steaming tyrants (1.8-2.3 buds)+ sweets

So why there is 2.5 buds higher end? There is a lot of pure offers around 2.2-2.3 buds and I didn't add any offers older than 2 weeks which were about 2.5 buds or slightly more in unusuals.