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Even cheaper is to buy something called a Sam splint. Basically the exact same thing but meant for splinting bones.
It's the strange irony that the medical version of this device cost 1/3 what the auto version costs.
SAM Splint and an ace bandage to set sprains or breaks.
If you want something to support a broken limb, check out a Sam Splint. Super light and compact, and great in a pinch to keep a flappy arm a little more stable.
Only $11.50 on Amazon.