Novels by Mark Greaney (Yonge & Elgin Mills)

My husband is reading "The Gray Man" by Mark Greaney. There are 5 books in the series, and I wondered if anyone had any to spare. The other titles are On Target, Ballistic, Dead Eye, Back Blast, and Gunmetal Gray. We would really appreciate it if you had any. We would be willing to return them once they have been read.