Since you're giving up your search, I figure it's okay for me to give you my 2 cents. I hope this isn't out of line, because I'm not trying to give you a hard time...
but... are you really wanting a ported 372xp shipped to Canada ($50-100) for $500-650? Hell, it costs somewhere in the $350 range to send a saw to Mastermind and back including port work. If shipping to you is, say, $75 plus the $350 for porting... then the saw itself would be worth about $75-225 to you?
Assuming the saw in question is in nice condition, (because who would send a ragged-out saw for expensive port work?), it should be worth $350-500 without porting. Add the $425 for shipping plus port work, that's a
minimum of $775...
I'm thinking that you should be in the $700-850 range, realistically, for a ported 372xp (shipped to you in Canada)... again, just my 2 cents.
With that said, I've got a woods-ported 2172(x-torq) with large dogs and a full wrap handle that I'd ship to you for $850. Remember, you've gotta spend money to make money!
Good luck on your new venture!