james,

titleist has a policy to not sell the head only.  there are a few dealers on ebay that sell heads only, but you're taking your chances as to if they are authentic or not.  might want to also try a local fitter to see if they have something laying around.

good luck.

- fred

Titleist recommends buying a new driver with a stock/no upcharge shaft.  At least on the 910/913 drivers, the shaft can directly replace the stock.  You might want to check options to sell the 910 yourself and see if it pays to go ahead and buy an authentic new driver and then swap shafts.  You'll have to evaluate those options yourself, since there is no buying/sellling on TT. 

thanks for all the great info!