What is the opinion of Reddit about the
Spud Black Belt Squat Large Belt for Weight Lifting Strength Training and Power Lifting?

I know you said Amazon, but just as a frame of reference. I have these: https://www.roguefitness.com/rogue-monster-bands

If I was picking two only for mobility purposes, I’d grab the green and the orange. Orange is good for shoulder dislocations, pull-aparts, etc. Green is great for various hip MOBs and stuff.

So just find the comparable on Amazon.

For a combo belt, I enjoy my Spud Inc Belt Squat. A bit pricey: https://www.amazon.com/Black-Weight-Lifting-Strength-Training/dp/B01CF60KCY