From eBaydotCA you cannot ship only to the USA. You must also ship to Canada.
From eBaydotCOM you can ship to the USA only.
From eBaydotCOM, you must use Flat Rate Shipping, unless you are able to bring your items across the border cheaply and easily and use the USPS for delivery.
From eBaydotCA, you can use either Flat Rate or Calculated Shipping, reflecting the actual cost of shipping to your customer from Canada.
Remember if you decide to use eBaydotCOM, that you must still tell the buyer that your products are shipped from Canada. This prevents the shock of slight postal delays or duty being charged.
If you are thinking of dropshipping, look up that term and think about the advice more experienced sellers are giving.
