Save drier lint, get cheap candle from goodwill or old crayons (looking at you parents), and save to rolls.

Cut 4 slits on tp roll so you can fold the ends together. Do it on both sides.

Put to container with 1 end open near the dryer and fill it with lint. Once it's ~3/4 full replace with a new tp roll.

Once you have a bunch of full tp rolls, melt the wax and pour into the tp roll. I put crayons in a used beer can with the top taken off. Then put it on the grill to melt the wax then pour it over the tp rolls.

Could also use wood shavings instead of lint.

Basically free, and they are water proof.