https://sellout.woot.com/offers/2-p...k-7?cjdata=MXxOfDB8WXww&utm_medium=affiliate& 2-Pack Flexelent Anti-Slip Squat Heel Wedge Blocks (Black w/ Lime Green Non-Slip Triangle-Shaped Grips) on sale for $19.99. Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.