Ecoo via Amazon offers the EcooPro Cable Management Sleeve 4-Pack for $15.99. Coupon code "DPGKMMSY" drops it to $10.87. Plus, Prime members bag free shipping. (Non-members can spend $49 to bag free shipping; otherwise, shipping costs $6.51.) That's $9 off list and the lowest total price we could find. It features a zipper closure.