I am still on the email list for Merry Go Round glass. They used to be in Addison, Texas many years back and I took multiple classes from them. Their Intro, Advanced, Lamp Shade and some other project classes. They were all outstanding.
I bought lots of glass and tools from them, too. However, I have not been to the Fort Worth store in quite a while. It is so much easier to order from Delphi these days.
Just to give you an idea though of what classes at DMS in stained glass are worth I thought I would post the info for classes at Merry Go Round. For a class from 10:00AM to 3:00PM they charge $125. They do provide materials and tools, which are not cheap, but getting the intro to stained glass is still a bargain at DMS. Thank you to all of the stained glass teachers, especially @PearceDunlap.