Actually Fred, it looks like he did. The subject says "TransAmerica Bike route breakdown". That would usually mean the Adventure Cycling Trans America route.
With that in mind...
Lots of folks have recorded their TA experiences in journals. Tons of them are on the Crazy Guy on a Bike site. You can start with ours at:
http://www.crazyguyonabike.com/doc/staehling2007Cost is WIDELY variable. If you camp and cook most of the time you can go pretty cheaply.
We averaged under $5 per night for campsites and motel rooms, but we very seldom got a room and stayed in city parks, churches, and other free places whenever possible. The AC maps were a great help in finding these places, but we also seeked out others on our own. We got some invites from generous hosts, which also helped a lot.
I don't have an exact accounting, but spent around $2k including airfare (one way only since we were picked up by family at the end)and everything I spent during the trip. This included shopping stops at the Patagonia outlet and the Pearl Izumi outlet. It also included quite a few restaurant meals and things like a rafting trip on the Salmon river.
I actually think I would have spent more if I were at home.
While we were on the frugal side, a true cheapskate could get by cheaper and some who want to stay in motels and eat in more expensive places will spent several times that much.