This is just a sample of the many OER business textbooks available. Search for others in the repositories linked on the left, or contact a librarian to help you find what you want.
Monopoly gas station is a simulation activity by Mark Maier from the Department of Economics at Glendale Community College. "Students predict the profit-maximizing price for gas at the one and only gas station in desert community. Then using data on demand and cost, they find the profit maximizing price and graph the result."