Oh boy! The Happy Hollisters by Jerry West is a great series that we enjoy! I found this lovely copy at my thrift store for $0.99. The lady shopping next to me probably thought I found a really valuable book when I cheered. Out loud. Apparently this copy was one of the most popular books in the series and is very easy to find. It's valued around $4.oo...but for the adventure, imaginative play, and excitement it envokes in my boys, I'd say it's priceless.