My favorite glass suppliers are Frantz Art Glass (Shelton, Washington) and Olympic Color Rod (Seattle, Washington). Both give great service and ship quickly. Both have very competitive pricing.
http://frantzartglass.com/ and
http://www.glasscolor.com
Frantz carries Moretti, Vetrofond, Double Helix, CIM, and others. Olympic Color Rod carries Reichenbach (both 104 and 96 COE) and System 96.
Right now Frantz is having a sale.