I just search kijiji in Canada or Craigslist in the states,when I lived there, for display cabinets and see what comes up. They are retail displays but I’m usually buying them from people who have had them for a while and I don’t really go for anything expensive. I’ve been lucky and have found a few for $50 or under with the intention of redoing them. I’ve taken the rotating display apart and have decided to remake the entire center section. I’ve already started it but I’ve had other projects come up so I probably won’t have it finished until the new year.