Materials for glowing sword?

Hi everyone!

I'm hoping to make a cosplay of Magik from Marvel Rivals for my upcoming con and am having trouble with the materials for her glowing sword. Originally, I wanted to use transparent worbla, but it will be way too expensive considering her sword (taking into account my height) will be around 65in long. Corrugated plastic sheets also won't work because of the holes.

Any affordable, transparent suggestions for what I can make the blade out of? Thanks!!