Alright let's try not to delete the proof this time...

Really old price, needs an update.

2 recent sales that I can confirm:

13 pure: http://puu.sh/eTXsp/ccb085957b.jpg

GE Cold Killer + Beams Yellow Belt (14.75) + Pro KS Aussie Sniper (sold for 3.5 pure: http://puu.sh/eTXDp/d97ae6db04.png ) traded for a Cauldron Bubbles Crone's Dome (27.5)

http://puu.sh/eTXVj/45bbe4aa2f.png

Belt + Sniper = (14.75 + 3.5) * .9 = 16.5 buds

27.5 - 16.5 = 11 buds

Hopefully I did this right, only my second suggestion.