Books

Cucumber & Cheese by Jeff Morgan (Minimum and suggested price: $14.99)
Watirways by Justin Ko (Minimum price: $0.00, Suggested price: $4.99)
Web Application Testing in Ruby by Željko Filipin (Minimum price: $0.00, Suggested price: $9.99)
Watir Recipes: The problem solving guide to Watir by Zhimin Zhan ($18.95)