I have a simple one-page online store, the 'buy now' button now links to paypal page. The problem is paypal doesn't support any shipping calculator.
The project is to create Canada Post shipping calculator where users can type their city, province/state/country/zip-postal code to get the shipping rate before they make a purchase.
Buy Now -> Shipping Calculator -> Paypal.
ps: The calculator will be displayed in 'fancy-box' /light box modal.