In May 2011, the price of the ´Boleta Touristica´ has increased to 35 Soles (about 13 USD). In Chivay, an official got on the bus and sold the tickets. During my time in and around the canyon, I was twice asked to show my boleta.
According to the text on the ticket, the area covered is in fact much larger than the Colca Canyon area, but that´s just theory. Outside the Colca Canyon area, nobody seemed to bother whether I had a ticket or not. No surprise, really, considering that I saw few other foreigners outside Chivay and the Colca Canyon area.