You're so right about the price point.

I have made $200 on a flip a few times, but it was on an $800
to $1000 drum machine. And like you said: it's about supply.

A "beat machine" is definitely similar. The most known are the Akai MPC series. They have a big following, but I've found them harder to justify flipping because an $800 Akai might only profit $50.

As an aside, I found your Remote Hypnosis course to be a perfect complement to the Chattel Report.