I bought my waffle makes at a thrift shop about 15 years ago. . .
an electric, square, honkin' big thing; couldn't tell you what brand it is. I think it has some sort of non-stick coating on it.
As long as I pre-heat plenty and my batter has plenty of fat in it, I do not have to pre-oil/greast it and my waffler does not stick.
When I got my waffle iron, I saw several of the same sort--maybe they stuck a lot for other people and they dumped them.
Try a thrift store? And self heating does work, with appropriate heating time and proper batter. . .