8-Pin Lightning Cable for iPhone & iPad that has over 50k customer review is probably the best accessory for your iOS device and the price is way cheaper than Apple Online/Retail store.
These lightning cables come in different sizes: 4 inches, 3Ft, 6Ft and 10Ft and the price depend upon the size. The lowest price starts from $6 that ranges up to $12.
Also, they are available in two different colors: Black & White.
From the Product Page:
- Apple MFi certified charging and syncing cable for your Apple devices
- Apple MFi certification ensures complete charge and sync compatibility with iPhone X / 8 Plus / 8 / 7 Plus / 7 / 6s Plus / 6s / 6 Plus / 6 / 5s / 5c / 5 / iPad Pro / iPad Air / Air 2 / iPad mini / mini 2 / mini 4 / iPad 4th gen / iPod Touch 5th gen / iPod nano 7th gen and Beats Pill+
- Connects to your iPhone, iPad, or iPod with Lightning Connector and charges/syncs by connecting the USB connector into your wall charger or computer
- Compact Lightning Connector head works with nearly all cases
- An additional layer of protection has been added to the Lightning and USB ends to improve durability and reduce fraying; Cables have been tested to bend 95-degrees 4,000 times
- Backed by an AmazonBasics 1-Year Limited Warranty