I've seen them before. There might be multiple suppliers depending on local distribution. I remember the ones I saw claimed to be ribeye, but when I saw them in the freezer they were extremely thin. Maybe 4 oz, and the packaging said that there was various stuff added including water.
There are a lot of things I'll get at a dollar store. I've seen great bargains on eggs and dry packaged foods. But meat there is just odd. I tried some burgers once and they were funky. I really wanted to break them up for ground beef, but they were kind of made with some sort of binding agent.