Why is it that you want a glass sippy? (I don't think you will find one, or at least I've never heard of it). If it's to heat the milk, just heat it in a glass bottle and then transfer the milk to the cup.
What about this idea i found online..."I dont think anyone makes glass sippies, but Nuby does make silicone sippy spouts that fit in a standard neck bottle ring.. they are designed like the silicone spouts on the nuby sippies. I bought them at Babies R Us and IIRC they were around $3 for a 2 pack. I do use these with my 26 mo but he still gets bottles w/ regular nipples too.
ETA: We also use the Evenflo glass bottles and the nuby sippie spouts work well with them"
"I was looking for the same thing and actually "found" a glass sippy. Born-Free makes glass baby bottles. So I purchased the glass bottle and switched the nipple out for their drink spout (which comes with their BPA-free plastic drinking/sippy cup; or you can also purchase the spouts separately). I had called them before trying this, as their products are a bit costly. But everything screws on fine onto the glass and now I have a glass sippy cup!"
http://www.diaperswappers.com/forum/archive/index.php/t-360393.html
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