Might as well start the PriceWatch activity.
If you are interested in the Montana and you're an AMA member, Garmin gives an 11% discount currently on the Montana 650. Discount + Tax & Shipping = $615.80 (in my case - your Tax/Shipping may be different).
Lowest price I've found so far (pre-orders) for the Montana 650 is:
@ $559.55 incl. Shipping.
Maybe an enterprising vendor will consider a "group buy price"?
The above pricing does not include Accessories: e.g, Rugged Mount, Marine Mount, Automotive Mount, Maps, etc.