One month into the launch of Windows 8, sales are sluggish, say some Asian PC makers – even the ones making the most popular products.

"Demand for Windows 8 is not that good right now," said Asustek Computer Inc. Chief Financial Officer David Chang.

He said the demand ramp-up for Windows 8 touch notebooks was slow and declined to give sales figures for the Asustek Vivobook, even though it's the top-selling Windows 8 touch notebook on Best Buy's website.

Asustek's larger cross-town rival Acer Inc. is closely watching the Vivobook because of its low price -- currently $479.99 from Best Buy . The Vivobook comes with an 11.6-inch touchscreen, Intel Core i3 processor, 4 gigabytes of memory and a 500-gigabyte hard drive.

In an internal email to other notebook department staff this month, an Acer manager wrote that the low price of their competitor's Vivobook has the potential to make touchscreen laptops more "popular." He noted that touchscreen laptops only account for less than 20% of shelf space at the moment because of their high price.