Where can I buy sheets of glass to make a backsplash for my kitchen?

I am wanting to take glass sheets of different colours and make rectangles (at least 4 inches long) and make a backsplash in my kitchen. I could use scraps or just plain sheets. I am wondering a good place to order them from for CHEAP. Is it cheaper for me to go to hobbylobby when they have their glass at 30% off or just buy online? Where is a good place?