Monoprice has the "Select Series Apple MFi Certified Lightning to USB Charge & Sync Cable, 10 ft Black" on sale for $5.49.
Right now, the 10 ft. lightning cable is $2 cheaper than the 6 ft. lightning cable (currently $7.49). (The 10 ft. lightning cable is usually $7.99.)
https://www.monoprice.c
The same item is available through Amazon for $12.99
https://www.amazon.com/dp/B010XP1…UTF8&
Monoprice "saver" shipping is free.