This issue was recently raised in the northeast sub-forum by someone looking to ride AC's Atlantic Coast route on a budget. If accomodations costs are an issue, I would not do the Atlantic Coast. Campground will almost certainly be far more expensive than out west. For example, state parks in NJ are $25/night for non-residents. Private campground can run you $30 and up/night during the summer. Back in early May I did a short trip from Port Jervis, NY to Philly. Two private places cut me deals for $15/night, but only because it was off season and the places were mostly empty. Full price would have been around $30/night.

FL and the other southern states in July and August? Would you like extra heat and humidity with your order? Even in PA and NJ it could be oppressive that time of year. August in Maine will be mucho crowded with people and the associated traffic.

You live in the northwest. Why not a one-way loop out there? WA, OR, ID, MT, WY and/or CO. Some nice riding. If you don't want to develop the entire route yourself, look into using ACA's routes as a starting point.