US Department of Labor
Bureau of Labor Statistics: Productivity and Costs
This site provides statistics for manufacturing and productivity in the USA in various economic sectors.
University of Colorado
University of Colorado: Principles of Microeconomics: Production and Costs
High-level site provides a definition and a numerical example for total product. You need to scroll down to the large chart to find this information.
Wikimedia
Wikipedia: Productivity
Provides a definition of productivity in economics, describes several models of production, and explains how productivity can be analyzed.
Econoclass
Econoclass: Birka: A Strategic Trading Game
This game, using multiple decks of playing cards, teaches the concepts of marginal benefits vs. total benefits. Each game takes about 10 minutes to play.