Electronics.woot! has the Amazon Basics 3' USB-A to Lightning Charging Cable (multiple color options) for $3.99 - $3 off with coupon code GETACABLE [Exp 12/31] = $0.99 with free shipping for Amazon Prime members or $6 shipping. Other sizes include 6' for $1.99, after code.

The 2-pack 3' is also on sale for $2.99.