I picked up a new set of gears off ebay for $730, after paying 300$ on S and F for used gears that weren't right. The ebay price seemed to be 200$ less than anywhere else. The gears came brand new in the merc box. I don't have any affiliation with them, but here's the source:
Aaron Lichter
Buster's Marine Service
1911 Cross Bay Blvd
Broad Channel, NY 11693
P: (718)945-4377
F: (718)945-4538