Some one else asked this question a month or two ago. I thought they had loacated a couple of laptops sporting seriel ports - Try searching the laptop section here.
Kind of sad as there is still considerable "older" hardware that requires Seral interface. Problem is that is can be expensive to replace some of the older harware. Aditionally some of the "newer" hardware still use the serial port for communications. Recently purchased a RH529 temp/humidity recorder. Requires serial interface to dump data. Just Bought a NEW digital O'Scope, Yep, uses serial. Both of these will work with the Seriel -> USB adaptor, AS LONG as both programs are not installed in the same operating system. Solved that - swap HDD in laptop depending on what I'm doing.