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Amazon.com has Bessey Tools 37" Clutch Bar Clamp (GSCC2.536) on sale for $ 8.99. Shipping is free with Prime or if you spend $ 25 or more.
Not the strongest, but unbeatable for the price. And it is 36", not 24".

https://www.amazon.com/dp/B000FA0….CbA88EE22