How Luke do you wanna get? TCSS and saberforge have upper parts that are pretty close. There's also a guy on eBay that makes not very accurate, but reasonably close parts that are individual metal pieces. He says you have to weld yourself-- but maybe jb weld or set screws can do the trick? If you search "lightsaber parts" he;ll come up. I think a couple people here have bought a few random parts for him. Again-- inaccurate, but great for custom work.
Should say that the TCSS pieces look the part, but are a much thinner diameter than the movie props. That said, they still marry well to flash parts.