If you can't find the cable that you're searching for online, the best place to look for it would be at local stores. However, in case that cable is this difficult to find, it could also be very expensive, so I recommend trying a simpler a solution: an RS-232 male to RS-232 female adapter. I've seen quite a few results in less than 30 seconds of searching and depending on your location, you can easily find and advantageous option.
