Balancefrom 3 in 1 Foam Plyometric Box Jumping Exercise $105 at Amazon
Amazon has the well-reviewed Balancefrom 3 in 1 Foam Plyometric Box Jumping Exercise (Heavy Duty, 60 pounds) for
$105 with free shipping.
Walmart has it for the same price. Simply rotate the box to get 20", 24" and 30".
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