doing this for this guy: http://backpack.tf/vote/id/5132b4454bd7b87a5500000f

http://www.tf2outpost.com/trade/8017744 - sold for 11 pure before the hat was retired.

http://www.tf2outpost.com/trade/8951220 - Just on market, C/O ~11.5

http://www.tf2outpost.com/trade/8426746 - This has been the only sunbeams stash on the market for a while so has a lot of good offers. I valued each offer based on the prices on this site:

14 buds - 14 buds (From friend scammer, not sure about him. Also he sold buds for money)

11 buds - 11 buds

11.3 - 13.2 buds - Circling Heart Bonk Boy + 2 bud

10 buds - Cloudy Moon Defiant Spartan

13.5 - 15.7 buds - Hearts Soldier's Stash + Hearts Gentleman's Ushanka

15.6 - 19 buds - Harvest Moon Brainiac Hairpiece (retracted)

11 - 12 buds - HOUWAR

16 - 18 buds - Cloudy Moon Company Man

13 - 15 buds - Burning Hottie's Hoodie

12.7 - 14 buds - Misty Skull Tossle Cap + Heart Baker Boy

13.9 - 17 buds - Cloudy moon le party phantom plus hearts fedora?

12.7 - 14 buds - Misty tossle + hearts baker

12 buds - 12 pure

The average low value is 12.5 buds, the average high value is 14.2 buds so that's what I'd suggest as the new price, although there are a number of offers higher than this.