Cambond via Amazon offers this 10-Foot Apple MFi-Certified Lightning Cable for $12.99. Coupon code "CQV8J5VH" drops it to $10.99. Plus, Prime members bag free shipping. (Non-members can spend $35 to bag free shipping; otherwise, it adds $6.03.) That's the lowest total price we could find for such an MFi-certified cable by a buck, outside of the price below.
A close price: SkivaTech via Rakuten Shopping offers a similar cable for $11.49 with free shipping.