Using a US Dollar credit card from Canada

[tonnerbeer]

I have a US Dollar account with my Canadian Bank for which I have a US Dollar credit card. Whenever I make a purchase on EBay in US Dollars, the charges to my bank have been converted to Canadian Dollars and then my bank converts the Canadian Dollars back to US Dollars for payment against my US Dollar card.  Fees are charged for each conversion.

How can I prevent the unnecessary conversions.    As an aside, isn't this rather unethical if not illegal?

[pjcdn2005]

That would be a Paypal issue but my guess would be that it is because Paypal for Canadians only processes funds in Canadian dollars hence the conversion. There are some posters here who might know more about it than I do so I'll page one of them. There are other posters here who might also be able to help but they are the boards often so they should see your question.  

@recped