I am thinking of buying the dayton 10" sub that everone is talking about. When going throught the buying process, the total with shipping is $157.72 But this is in american funds correct? I have never bought anything online with a credit card before nor anything that is priced with american money. How do I know exactly how much in canadian money I am going to pay? Do I just go by what the exchange rate is at the time of purchase? or is there some sort of hidden fee for buying something american with a canadian credit card? Thanks PS oh ya, this is from the partesexpress website btw.