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I have one that I bought at the Sand Sport Show in Costa Mesa but I have seen them at Gilmore's on vendor row. Be sure the mount you buy has a rubber bushing between the part that mounts to the bar and the piece that holds the GPS, this will reduce the amount the GPS vibrates when riding. Another thing I found is to use 2 sided tape to hold the batteries in place, mine kept turning off while I was riding before I started using tape on the batteries.
YEAH, WHAT HE SAID... and also.. tie the lanyard from the gps to your handlebars JUST IN CASE the unit does come loose. I have a garmin mount for mine and I rolled my bike 3 times down a dune at the golf gathering... popped 3 outta 4 tires, but the gps didn't move for shiat!!!