In the past, we have suggested a couple of different things for folks that want to send their bikes to their starting point ahead of time. One is to get in touch with one of the bike shops on the map, and send it there. If doing this, most folks go ahead and get the bike shop to put their bike together (generally around $25 per bike) so that they are ready to go when they pick them up. The other suggestion is to go ahead and make hotel, hostel or campground reservations for when you are arriving, then ask to ship the bikes there. They can then hold the bikes for you, and they should be there waiting for you when you arrive.
Hope that this helps. Good luck with your planning.
routes and mapping
Adventure Cycling Association