A4C via eBay offers the OEM Samsung 3-Foot microUSB Charging Cable 3-Pack, model no. APCBU10BBE, for $3.30 with free shipping. That's $1.10 per cable and tied with last week's mention as the lowest total price we've seen for this quantity. (It's also a current low by $5.)
Need more cables? Add two packs to your cart to drop the price to $4.94. With free shipping, that's six cables for 82 cents each and another price low.