Always.Deals via eBay offers the OEM Apple 3-Foot Lightning to USB Cable, model no. MD818ZM/A, for $4.49 with free shipping. That's tied with our November mention as the best price we've seen for a single cable. (It's a current low by $2.)
@polirudb If it was genuine Apple or MFI Certified it would be compatible with any Apple device having a Lightning Port, including the 6s. At $4.00 you can bet it's a fake that won't sync and be lucky to charge.