Cost was $133 (prepaid on our reservation) plus gratuity. We tipped the driver ($30) in cash. Booking was confirmed to our cruise reservation on August 5th for sailing on September 18th, so about 6 weeks out. I had not priced private car services, since booking through
DCL meant we would be met as we exited the customs/immigration check with our luggage and be taken directly to our waiting vehicle. This was the final stop after b2b2b sailings that started 26 days earlier, so the cost was a small price relative to the total cost of the month-long trip (including 4 nights in London prior to the first cruise).
We elected to do private transfers after our experience at the end of the WBTA in 2016. We had to move our luggage from the port across the street to a very crowded taxi line where we waited about 75 minutes for an available taxi. This time, we planned for an extra suitcase which we would purchase onboard, knowing we would be able to check it on SW for the flight home from LGA. Too much trouble to manage all the luggage at the end of the long trip.