Try the manufacturing plants. It does come in rolls, that is what these companies cut off of to rip us off because of demand. The supply is there we just keep buying like this so they sell it to us at outrageous pricing. The only way they get away with it is because "hobby" people use smaller quantities.

Perhaps Dow Corning or Dow Chemicals or whatever. Ask them for silicone tubing of your needed I.D. and wall thickness and see what they come up with. I've got other suppiers as well but not in front of me.

I get caulking gun tubes of silicone grease (very heavy) for 26 bucks a tube. Compare that to what Hobby distributors charge for "Differential Grease". Unbelieveable !

Blessings to you..