Uni-Fam via Amazon offers its Uni-Fam 55cm Exercise Stability Fitness Ball
in several colors (Black pictured) for $17.99. Coupon code "SOAT2FU9" drops it to $10.79
. With free shipping
for Prime members, that's $7 off and the lowest price we could find. It features a 2mm PVC casing that supports up to 2,000 lbs. Deal ends December 11.