You can't find one. I built one when I was 15 about 12 years ago. I made it out of nylon camping string ($2.99 back then) and simply drilled a whole through a tennis ball and strung it through. Hang it loose since it isn't a doublt end bag and you want it to move.
put a tennis ball in a vise on a drill press, drill a hole through it, place your elastic cord through it, put two knotts on each side to hold the ball where you want it then attach it to the floor and ceiling. Works fine Rafter
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