Hello 'joe_jager',
<<How can I maitain that US price??>>
You can, of course, list in the American ebay.com if you want to, but if you simply wish to sell in US dollars that's easy:
Use the Advanced form for Sell Your Item. (The short version only has Canadian $$).
Under the Category options you should see the currency choices. . . . For now, at least, there is a choice.
Happy selling! 