回複:請您仔細上www.cic.gc.ca查看
You can pay either Canadian dollars or US dollars if you are in US.
$550 is in Canadian dollars as shown in
http://www.cic.gc.ca/english/applications/fees.html#swpf. If you pay in US dollars, it will be $465 for pricipal applicant and spouse. See link
http://www.dfait-maeci.gc.ca/can-am/menu-en.asp?act=v&mid=5&cat=68&did=1261#IMMIGRATION