I only know of places South of Ottawa, but here's a start for the Niagara Falls area:
Mailboxes Etc.
1623 MILITARY RD
NIAGARA FALLS, NY 14304-1745
(716) 298-4461
mbe2194@mbemail.com
They probably have recieving services, being so close to the border but I don't know what their prices are.
Keep in mind, if you go in person to pick up you do not have to pay brokerage fees on any parts you are importing for personal use. You would only need a broker when you import a whole car.