I don't have to have an Rx for supplies. I also don't replace them as often as they recommend becuase of the portion I have to pay. I just replace the liner when it starts to leak air.
The machine should probably not be on the floor, but I had to put mine there. In my sleep I pulled my second machine off of the nightstand and the water ruined the motor, so it had to be replaced with a new machine. Thankfully, I did not have to pay again. It took me a year to pay my portion of the machine. I learned my lesson and I put it on the floor.