The backyard Walden house design studio cost less than $500 to solar power up. The solar panels and kit cost $315 at COSTCO and the 12-volt rechargeable battery cost $73 at the House of Batteries. We posted the first solar powered PSDS scan from here 05-16-2009. The new marine is the boy at the front of the group picture and his older cousin in front of the tall blond girl is a marine veteran. The grandchildren are mostly grown and the great-grandchildren are now learning solid geometry and making Platonic solids.