2003 Ford Taurus leaking passenger side by oil pan?

Oil pan gasket been changed 3 times because I thought that was the problem.still dripping the smallest bit of oil. No puddle because exhaust is right under drip so there's a smell from time to time. But I can see oil on the bottom of car by oil pan. Timing cover gasket was replaced, head gaskets been replaced. What else could be causing the leak? Shop says it HAS to be the oil pan even no there no visible damage to it. They re going to charge me 250$ for have it replaced.before I make the decision I need opinions since I've already put too much money into it already. Still need to drive for 2 years. Small oil leak worth the money to fix?

Valve cover gaskets and oil pressure switches are common problems.

This time when you take the car in for repair just tell them it has a oil leak and don't tell them what you want changed, you might find they will find the leak and fix it one time. Not like the three times you told them to change the pan gasket.