Good news! I got both my shipments today (HA and the Zooper) and NEITHER had duty charged on it! The FedEx guy simply came in, dropped off the stroller, and left. At the post office, the clerk gave me my package and that was that. I asked if I needed to sign anything or "anything else"... and she said no! So I guess either I don't know how to read Canada Post notices, or else CP just missed out on $30 due to a clerical error. Either way, lucky me! :P
Thanks, Marina for clearing up the duty issue though - in the future I will be more careful with duty! I did end up paying about $9 duty on my HA shipment of roughly $65. Oh well!