After seeing some pictures of mag-reg ballasts and learning how they work, I kind of want one now to take measurements and do experiments with.
Does anyone know where I could find one?
Thanks in advance!

These ballasts aren't too common. You can probably get one from a HPS street light from the eBay seller with the SOX street lights. He has quite a few lights that have them. So far I've seen 100w and 250w HPS ones with them but I do believe he also has 200w HPS ones too.