You can get cheap Lightning cables just about anywhere, but if only the best will do, you should give Anker’s PowerLine models a look.
These cables are built with kevlar fiber and feature reinforced stress points, which means they can last 5 times longer than typical cables. I own a couple of these, and while I can’t yet speak to how long long they actually last, I can say that they just feel extremely well made. Weighty, solid, premium. In fact, I just bought three more to replace my most used & abused Lightning cables on my night stand and in my car.
Today on Amazon, you can buy three for $22, which averages out to about the regular price you’d expect to pay for a standard third party Lightning cable. With a near-perfect 4.8 star review average, I’d say they’re worth every penny.