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Do you mean a block heater? DId you get one installed from the dealer or do all Canadian cars come with them? Should be hanging around the grill area near your front bumper.
Block heaters in Canada for S2000s is not an automatic inclusion. Mine came from Quebec and I had to have it installed when it got to Calgary.
Look just below the exhaust header and aft of the oil filter. If you have one, it will be installed there. Then you can follow the electric cord to where it ends up as a 3-prong plug. Here is a picture of what it looks like with the header out of the way:
