If mailed via USPS then CanadaPOST will charge you their normal entry processing fees and any duties that may be applicable then GST and PST.
If they ship to you via UPS or FEDEX then you are going to be charge a minimum of US$28 plus plus plus. You can call UPS and/or FEDEX Trade Networks and they can give you an estimate of what the costs will be like.
Both UPS and FEDEX base their costs of the DECLARED VALUE of the item so the higher the bid goes the more you will pay UPS and FEDEX.
Cheers,
TIM @ FTL