Betdaq Direct via Amazon offers the the Cpokoh Anti-Burst 65cm Yoga Ball with Foot Pump in Silver or Blue for $17.99. Coupon code "8EB3VNC3" drops the price to $7.92. Plus, Prime members receive free shipping. (Walmart has a similar ball for the same price via in-store pickup.) That's $1 under our mention from two weeks ago and $2 under the lowest price we could find for a similar ball purchased elsewhere. It's slip resistant and includes extra plugs and a workout guide. Deal ends August 31.