Currently the best prices I've seen from a source I'd trust are from Landfall Navigation.

I know at least a dozen folks who have purchased one, about split evenly between the ACR and McMurdo. So far, everyone seems happy with them, everyone wishes they were smaller and cheaper. <img src="images/graemlins/grin.gif" alt="" />

Best value I think is the ACR GyPSI if size and weight aren't a major issue and you are already carrying a GPS anyway. If weight is an issue, go with the McMurdo.

Hope this helps.