Available on special order
They can get it. Your library might be able to shake out a copy.
It wasn't one of his bestsellers, but as a science geek and Mars nut it was so totally on track I was gobsmacked.
Personally, I think the guys who write about water on Mars should also publish in the S.F. section, but they'd never get the sales that Harry does 'cos their stories don't hang together. At least Harry is smart enough to say up front that we need a different planet than Mars!