Perhaps this is old news, but my latest trip to Puerto Vallarta finds that the cost of tennis balls has skyrocketed. Three years ago when I last visited, I went to WalMart to purchase tennis balls and found they were about $4 US/can. Strangely, I went yesterday and they were 180 ($12.50 US) pesos at WM for a can of Wilson premium balls, while at the Canto del Sol tennis club they were selling for 200 pesos/can ($13-14 US). One of the locals said they usually buy new tennis balls on Amazon. Too bad, as I left all my fresh cans at home this trip...