I'm seriously going to hit up the merchandise line after the initial crush of people and just straight up ask "so ... how much for one of every lightsaber part and a full set of crystals?" and if that price is within distance of a full feature lightsaber from someplace like Vader's Vault then I will be buying right then.
They'd be stupid to not sell the parts individually. Or maybe make them have an exclusivity to have repeat buyers be rewarded with extra parts or something (that is the worst case but...it would make Disney tons of money).
I really want all the crystals.