All of the glass supplies I use I have purchased in classroom kits from eNasco and Dick Blick. The glass refills come from Blick.
To let it be known, I am not a paid sponsor of any type for Nasco, Blick, or any of the glass supply companies that I will mention. I also have a very limited background on glass art, except for what I have self-taught myself in the last year since I purchased my glass kiln for my room in the summer of 2011.
My glass kiln is a Skutt Hot Start electric kiln. It comes pre-programmed with a slow, medium and fast firing schedule for doing a full fuse (melting glass together to be a flat sheet), a tack (melting the glass enough so that it sticks together; will still have raised aspects to it) and slumping (heating fused glass in a mold so that it slumps to a bowl/plate shape). The kiln is about 12" round and about 8" deep. It only has one shelf, so when I work with the 6" glass pieces, I can only do one at a time. When we work with the 3" glass, I can usually fit 4-5 in the kiln, depending on if I am fusing or slumping.
Note: I cannot fire clay in this kiln. There are kilns you can purchase that do both, however since I have virtually no clue about the temperatures that you must hold the glass at, I decided a kiln with an automatic firing system would be best!