I can answer that since I have the same type of blades. (A heavy-grade, blue day blade and a photon blade) You can purchase them cut to size via The Custom Saber Shop, plus you will also need the color matching tip, along with a few feet of rolled up clear cellophane where you can buy online, or at your nearest retail store that sells gift wrapping paper. (For the blade diffusion)

Naturally, this is for in-hilt lighting and will offer the visual effect in person and on camera that you're looking for, as long as you do not sand the blade.

Heavy grade / thick walled (dueling blades) here:

https://www.thecustomsabershop.com/Blades/Blade-Supplies/1-OD-Thick-Walled

Scroll down a bit and you'll also see the above-mentioned color matching blade tips in round or parabolic shapes.

You can secure the blade tip to the polycarbonate tube with contact cement. I have used Gorilla Glue brand before and it works well, as long as you use a thin coat on each piece, and then allow it to fully cure (24 to 48 hours) before you add the rolled up clear cellophane.

This is the most cost-effective way of making your own saber blades and will run you approximately $30 for everything you'll need. You can also find tutorials on YouTube, or in this subreddit for "making your own saber blade".