- BootsNAll: they tell you how to legally get out of paying the fees.
- Matador Network: Guide for Americans
- Project Visa: (Their info for Peru is wrong: says you can only get 90 days when it was changed to up to 183 days quite a while ago. Be sure to double check their info.)
- South American Living: info about Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Peru, and Uruguay.
- Wikipedia World Wide Guide: has to be included in the list
Travel Magazine
If you're in Peru chances are you're going to want to travel to other countries nearby. Keep in mind that you'll probably end up paying visa / entry fees. Here's some info on what those are.