@waldoj This is just how healthcare billing works. They know your insurance will only pay a few bucks for an office visit. And they also know the insurance company will let them mark up ordinary medical supplies 1000%.
For a chronic issue of my own, I’d spent a decade trying out various $30 Amazon orthopedic devices, and then I saw a specialist whose office staff handed me something nearly identical and billed my insurance $200. I guess it’s a little better? I can’t really tell.