Hi Camie!
Have a look at Arrow Springs' website.
www.arrowsprings.com Click on Catalogue, then click on Glass, and they have a list of many of the different brands. Each brand you click on, Lauscha, Vetrofond, etc., has a page that lists the COE, annealing temp, etc.
If you're interested in trying a particular brand of glass, get a sample pack. Those are labeled (one would hope), so when you want to order larger quantities of what you like, you'll know what to ask for.
Hope this helps!
Sarah