Try Ocean Helicopters in West Palm Beach, Florida for cheap hourbuilding. They regularly have ferry flights in R22's and R44's and offer R22 hourbuilding time at $150/hr. Their instructors have over 1000 hrs and are very experienced at cross country ferry missions.
www.oceanhelicopters.com
They have a trip coming up in the next week from Florida to Maine, approx 20 -25 hours. Its a great way to build hours cheaply, quickly and gain vast real world cross country flying experience. Ideal for CFI's who have qualified in the Schweizer and need Robby time or for CFI's who have qualified with low time and need a few extra hours for the SFAR sign off.