There is no marketplace next to the pier in Freeport - or at least there wasn't when I was there last year. Freeport is quite ugly at the pier -nothing but a big factory.
You would need to take a cab to Port Lucaya, or to the International Marketplace located on the cab ride to Freeport. I don't remember the exact cost of the cab ride, but I believe it was $10 per person.
Carnival Elation March 11
Carnival Imagination Sept 07
Carniival Sensation Dec 06
RCI Sovereign of the Seas Sept 06
Carnival Miracle Sept 05
Carnival Glory Sept 04
Carnival Fantasy Jan 04