My wife got me a back massager for Christmas that sits in the chair kind of like one of those mats that cab drivers sometimes use. However, this one, covered in leather (or a good imitation), does both vibration and a kind of rolling or kneading style massage. It also has a heater. I don't know where she got it or what she paid, but I would be suprised, maybe even upset, if it was hundreds of dollars.
We have a store in our area, it called Relax the Back, if you google it, you'll be shocked at the prices, I have stopped in a tried a few. the one chair with Zero Gravity is great for me, but its over $2,000.
let me say again those chairs & they even have on chair that's over $6,000.
take care
John