knee braces, knee pads, elbow pads (Bitterlake Seattle)

looking for a pair -- matching or not -- to use for PT exercises. Need to protect the InSiDE of my knees against floors.

Very regrettably mine were taken during a car break in today.

I am also hoping to find constructive-type knee pads, just as needed, and elbow guards, of the ilk in line skaters use.