A friend of mine is looking at purchasing a 2003 center console boat with a 115 Yamaha 4-Stroke. The boat is made by a company called Scout. The dealer is charging an extra $900 for what they are calling dealer prep. Is it the norm for a dealer to charge dealer prep on a used boat? I would think any extra charges would be built into the price. You don't purchase a boat from a private owner and pay any prep charges.