I owned both the Magic Quartz broiler and the M Q Rotisserie. They were superb small appliances and unique even then. There is nothing comparable today. I gave mine away in a moment of folly, when moving, and have beent trying to find replacements since the late eighties with no results at all. I have been searching the Internet for at least eight years, but the name Magic Quartz is totally unknown. I think there may be ten people in the entire country who are familiar with the name.
I wish you luck in your quest. If you ever find a small supply, do let me know, please. But I think it will be pretty hopeless.