Craftsman water heater parts cannot be purchased on sale anywhere, because they do not exist. Craftsman is a Sears-owned brand of tools and lawn and garden equipment, and it does not manufacture water heaters or water heater parts.
U.S. Craftmaster is a similarly-named company that produces water heaters. The company also sells replacement parts for its water heaters and maintains a current price list for parts on its website. Sears Parts Direct sells parts for U.S. Craftmaster water heaters, but they cannot be purchased on sale; Sears sales, promotions and gift cards do not work on the Sears Parts Direct site.