They are not for belting the shit out of , they are for technique otherwise you will damage your wrists (with one bad shot) and get sloppy.
Yard sales you get them cheapest, ebay and pawn shops next.
Other than that a canvas ex army bag from the disposals and fill it your self maybe with cut up clothes the opportunity shop dont want any more.
Heaps of ways to make your own you'll see a few to the right of the utube vid, cheapest I seen there would have be a roll of old carpet from the back of a carpet shop dumpster (they always take the old ones away and dump them. taped it up with packing tape with rope down the middle of the hole through a hole in a circle of something down the bottom ,you just have to have the whole thing long enough so you dont kick that plate on the bottom or hit it.
Actually if you looped two very long ropes through the outer part of the carpet roll (maybe one or two layers in from the outer roll) so the loose ends went out the top the 2 loops running under the bottom would support the bottom of the roll, Tape it up Wrap it in glad wrap first, and you'd have four single pieces of rope coming out the top you could tie them off in one knot then hang it.
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