Advice Needed on New Garage Roof

Just had an inspection of a house with garage we’re thinking of buying. We knew that the shingles on the garage needed replacing, but the inspector tells us that the whole framework of the roof—rafters, etc– is riddled with termite damage and must be completely replaced (walls are cement block). Problem is, the garage is attached to the garage of the next-door house, and the inspector says it almost certainly has termites, too. The people next door may not be willing to do anything about the problem on their side. Is it possible to replace the wooden framework with a metal one (termite-proof)? And if so, how would the price compare with wood? The garage is 17 X 17.