My r200 is a open diff and not LSD(unfortunately). Are you buying just for the gear ratio ? I can send pics when I get home or you can go here:
FS: R200(Longnose) Open Diff $150 obo - Datsun Parts For Sale - Ratsun Forums
I don't know how much it cost to ship to the eastcoast but I'd imagine it would be $100+ !