I would like to pay through play store but the thing is I have paypal money (which I just realised that I miss like 30 cents -.-) and I would have love to buy it through play store if there was some kind of paypal method.
I'm not going to worry about 30 cents or similar if you've got $9 there now.
Another option is Play gift cards. They aren't generally available in Canada yet, but I've heard that Target (in Canada) may be selling US cards now, and the US cards are apparently working for Canada residents now I've heard.