Ok Im clueless, Im needing, something PCI that has or is a RS232 serial port. I remember older PC's having them, but, my Dell

only has USB.
So, how can I get my hands on one to install on my system, I cant really spend much on the dern thing seeing Im only going tobe using it once to load some maps to my Garmin.
Any ideals?
~S~
Zulu