Amazon.com has the iPhone 5 Lightning Cable for just $16.99. This is not a knock off that will possibly cause fire or damage your device. This is a genuine Apple cable. Apple has been selling these for $19.00 and they never go on sale.
Now you can save $2 or more if you do not have to pay tax, and they qualify for FREE super saver shipping as they are offered directly by Amazon. This is a good deal for people with Amazon prime as you get free 2 day shipping.
You could also get the Amazon basic Lightning cable for $14.99.