Moving a sofa

Hi

I was wondering if anyone knows of an inexpensive way to move a sleeper sofa from Park Slope to Crown Heights on Monday/Tuesday. A friend on 15th street is moving and leaving me her couch if i can get it to New York Ave. Whats the best way/person/company to move it? It is too too heavy for me and my female roommates to get up to my fourth floor walk up... Eeek. It's a good deal and a nice couch if i can just figure out a way to get it here. The cheaper the better as I currently jobless