Silicone Tubing

I want to replace y tygon tubing in my WC setup with some silicone tubing. Problem is, I can't find this stuff anywhere. I think my rig is setup for 5/8" tubing (don't remember exactly, I'm at work). I figure I'll get 10-30 feet of it (already planning ahead to my next case;) )

Any places locally (Houston, TX) or online?

mcaster.com sells a bazillion different kind of tubing, including a clearflex performance imitation for .30 cents a foot, I bet they have it.

you've probably got 5/8" OD and 1/2" ID