I had one but it grew legs and walked away. Want to buy one that is round with the groove and has 4 pins. If you got one that collects dust and want to sell it...let me know please!
I've got a couple of older Garmin GPSes that I don't use anymore. I'll check and see if I have a spare power cable, but you're going to have to wait until I get home (maybe later this week).