Where' s the best and cheapest place to get the maptech terrain navigator software for my Magellan 315 GPS?

I' ve not purchased it yet but I' m close. I' ll probably buy it from their website at:
www.maptech.com

You sure maptech works with magellen? i thought their program was called mapsend?? or datasend?? I have the maptech program for the eastern USA, it is topo maps on a cd and allows you to print out your own maps. think i misunderstood the question, thought you were trying to load it into your gps. it can be used with most gps units to download waypoints, routes to the maptech program and upload waypoints and routes back to your gps. sorry.

The website features a gps compatability chart.