Nothing wrong with saving some money, but with all due respect in a professional setting that has anything to do with providing medical services $165 for a therapeutic device is pocket change. If you must here are foam bike grips that look like the ones in the right pic: foam grips
Ball bearings are easy and a trip to a hardware store or a building supply would likely find some tubing. In the right pic it looks like there's something inside the tubing stiffening it under the handle.
Mocking something you know nothing about is narrow minded. Lots of things outside of traditional Western medicine have positive results.