I picked up a scale from our local Tractor Supply Co. It was around $45 and goes up to 110#. Looks very similar to this:
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Pros: goes up to 110#. seems accurate as tested against bathroom scale (but is
that scale accurate?).
Cons: very hard to read weight because it has kg and lb and the numbers are too small. Heavy. Noisy when exercising a bow on the tree.
I really wish I had something easier to read from a distance but I guess this works. Wouldn't recommend it since it seems like there are better options out there...