GPS City is selling the Montana 610 GPS for $350, $50 cheaper than you can get it on Amazon. Here's the direct link:
http://www.gpscity.com/garmin-montana-610
This is a great GPS for motorbiking - it has a large screen, can be easily seen in the sunlight, and has a touch screen that works great with gloves on. I have the 600, the previous model.
They also have RAM mounts on sale for 20% off with the coupon code
SPRING17.