Hey Arch!

I don't have a specific source, but I was really surprised when I
Googled 'silicone o rings'.

Here's a link. I didn't cite a source as some of these guys are
selling a few at a time, and some selling large quantity only. Some
are food grade, some are temp graded, etc.

http://tinyurl.com/5v2hkt

So whatcha makin' ?

Robert