Bob operates a watch repair business in Mesa, Arizona. He orders most of his parts from out-of-state supplier, including watch faces from a supplier in Escondido, California. The supplier does not have a sales force but relies on catalogues shipped to watch dealers throughout the country as his means of marketing. Bob installed several of the suppliers' watch faces on his customers' watches. A strange chemical reaction between perspiration and the faces of the watches caused Bob's customers to develop rashes and nausea, with some requiring hospitalization. Bob wishes to bring suit to recover damages ($250,000) from the Escondido supplier. In which court should Bob file suit?