Plexiglass. If you know someone with a fancy saw, or if your home supply/hardware store REALLY likes you, you can do it that way. Beyond that . . . um . . . then you're into making a model of it, making a mold, and casting it in polyester resin, which wouldn't be exceptionally difficult . . . I'm not sure how it would come out though.
Other thing is, if you're not too picky, get one of those light-up play swords from the toy store and remove the blade or do something else to hide the handle.
We apologise for the fault in the signature. Those responsible have been sacked.