I’ve had fantastic private shore excursions for 1/2 the cost of Celebrity one that comes to mind is Istanbul. We went everywhere in the city. Even Hagia Sophia which was supposed to be closed! We had a delicious lunch in a local restaurant of Turkish food. The guide then took a few of us to the spice market. Things got a bit tricky when he couldn’t find a cab (the bus took the rest of the group including DH) back to the ship. Luckily we agreed to pay a cab driver double the fare. We made it! Celebrity was charging $250 a person. We paid $100 for a far better tour.