Galactics via Amazon offers its Prime members the Microsoft Notebook Cooling Base in Black, model no. Z3C-00005, for $12.69 with free shipping. (Non-members can spend $25 or more to get free shipping; otherwise it adds $9.13) That's $1 under our September mention and the lowest total price we could find for this base in any color by $3, outside of the price below. Sales tax is added where applicable. It features a single fan, contoured base, flip-stand for desktop use, and USB connectivity.

A close price: Meritline offers it for $12.99 via code "MLCKS31ANL1" with free shipping.