Cambivo via Amazon offers its Cambivo Open Patella Knee Brace 2-Pack for $24.99. Coupon code "DEALNS30" cuts it to $18.99. Plus, Prime members bag free shipping. That's $34 off and the lowest price we could find. Each features a reinforced stabilizer ring, 4-spring support, built-in muscle tendon protection, adjustable Velcro straps, and anti-slip silicone gel. They fit knees measuring 12.5" to 18" in circumference. Deal ends November 20.