The ability to leap seamlessly between parallel universes hasn't been discovered yet. But using a very loose definition of the word "working," and with $US40 ($54) (or less!), you too can make your very own portal gun from Rick and Morty.
DIY Prop Shop figured out how to make the whole thing out of cheap, unfussy materials. The bulk of Rick's signature gun is ordinary plastic in form of sheets or PVC tubing. A whisk and a bubble wand become the handle and plasma tube, respectively, and the entire thing is wired up to glow green.
Considering many of Rick's inventions are built in an ordinary suburban garage, these materials probably aren't far off from the real thing. If only we could sort out that whole multiverse problem.