You can utilize Cruz del Sur to lookup bus schedules and prices. Remember the fact that any journey from the mountains will be a slow experience! Lima to Cusco can take above 21 hours and prices 185 PEN, however you will get a ticket for as little as 39 PEN https://raymondsgrep.is-blog.com/36994489/travel-peru-reddit-things-to-know-before-you-buy