I came to Peru in June 2010 on short notice and had little arranged. After wandering around Cuzco looking for a suitable tour operator, I luckily stumbled into Ruben at South Adventure Peru Tours, and he was terrific at booking activities for me. He hooked me up with a Salcantay to Machu Picchu hike and a Sacred Valley bus tour. I don't remember the exact price, but it seemed ridiculously cheap considering how inclusive it was. And Ruben is terrifically personable -- he even greeted me with a hug at the Cuzco train station when I returned from Machu Picchu. A big recommend for South Adventure Peru Tours.