When my cars (2 with timing belts) go past 200K miles I’m not sure what I’ll do. They each will get timing belts at about 180K. When they would be due for a 3rd belt at 270K miles I may just let it ride. The cars (an '01 and '03) won’t be worth much at that point.
You maybe facing a similar question soon with your car. Is the body and rest of the car in good shape? The belt on the car now could last past 300K miles. It is your decision, spend the bucks or let it ride?