There will be a service /brokerage fee from the shipper. This starts at $10 with Canada Post and around $25 with couriers. It goes up faster with couriers.
There may or may not be duty, depending on the place of manufacture (not purchase) of the item.
There will be sales tax, just as if you bought them locally.
If your seller insists on using the Global Shipping Program, your costs will be increased by the fee charged by Pitney Bowes. Because the clubs will be shipped to a central point, then trans-shipped to you, expect delays in delivery.
Best bet, ask your seller to ship directly by USPS/Canada Post. Second best, ask him to use a courier and upgrade to Express Shipping which includes the brokerage fee, but not the duty and taxes.