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You could do a grind/cut/thread/swap and then choose whatever knob you want... you'll have something different than the guy at the next shooting station.
check this out
http://w ww.ebay.com/itm/Savage-Tactical-bolt-handle-RH-fits-Sav-110-11-12-CNC-Machined-tactical-knob-/251265944075?pt=LH_DefaultDomain_0&hash=item3a809e0a0b
I would go with Brownells or Jerry at Mystic Precision. You can always offset the shipping cost of Brownells by buying more stuff, it kind of makes it cheaper by having less shipping cost per item.