I have a Quick Release GPS Holder for sale. It bolts to the top of the handlebar clamp with new supplied bolts and hardware. Its made so that you can easily remove the GPS from the bike by lifting one tab. I paid $89 for it in June. I'll sell it including shipping within the USA for $50. Let me know if interested.
Here is some text from Twisted Throttle's web page:
The SW-MOTECH vibration-damped quick release GPS mount securely positions your navigation device on top of the handlebar clamp with a shake free foundation that permits clear viewing and convenient interaction. Sturdy laser cut steel bracketry is powder coated black and features a pivoting head to avoid distracting reflections and provide the optimum view. This unique GPS mount has a quick release mechanism that allows removal with only a firm press of the release tab. Easily bring your device with you when you park your motorcycle and never worry again about it getting stolen while you're not paying attention. Install the vibration damped GPS mount on your Honda VFR1200X and find the curviest roads on the map!
Navigation / GPS quick release mount with AMPS hole pattern
Sturdy laser cut steel bracketry integrates perfectly with the handlebar clamp
Isolates the device from engine and road vibrations
Durable powder coated black finish provides a factory appearance
Convenient quick release mounting and un-mounting with the firm press of a tab
Reduces risk of theft when quick release is used and device is kept on person
Mount pivots to for optimum viewing angle
Conveniently locates the GPS unit just below the riders field of vision
Universal AMPS hole pattern is compatible with various mounts & GPS cradles
Securely mounts to factory handlebar top clamp without modification
Vibration Damped GPS Holder for Honda VFR1200X