Sell Answers to my courses for additional money

I would like to be able to create an easy way to allow students the opportunity to purchase a complete section for all of the quiz answers at the end of the course, for an additional fee.

For example, if a student passed the course but still wanted to know the exact answers to the questions they did miss it would be great if there was an easy to allow them to purchase the right to view these answers without creating another course or module.