Just came across this whilst browsing Fox Suspension Float RP23 Boost Valve Rear Shock 2012 | Buy Online | ChainReactionCycles.com and had to order one, the boost valve isnt available on the 2013 models in this size so ive been searching for one of these for some time.

cheapest ive seen them yet and the non kashima model is also available from here for even less. bargain. thats what credit cards are for