Look in the phone book or try a google search.
I happen to do pipe insulation for a living.
The company I'm working for atm is called EJ Bartells. I know they would sell it and ship it to you.
That peel and stick stuff they sell at the box stores is crap, even using it on the proper size pipe.
In a pinch you can use wall insulation. Get the thinnest you can find and either spiral wrap it or cut it to size and put it on lenght wise, holding on with duct tape.
Then what ever insulation you use, you will want to protect it from getting wet. You can use visqueen. Cut it in whatever lenght you want to handle ( 10') and wide enough to wrap around with about a 3" lap that faces down ward. Duct tape again.