Amazon offers Prime members the Monoprice 3-Foot Power Extension Cord, model no. 105298, in Black for $1.88 with free shipping. (Non-members can spend $49 or more to qualify for free shipping; otherwise, shipping costs $6.03.) That's the lowest total price we could find by $2. It features IEC C/13/14 connectors.
Note that it's expected to ship in one to two months.