SIM cards in Canada that work with an AT&T locked iPhone?

I need to find a carrier in Canada that will work with an iPhone locked to AT&T. Either that, or where I can find an AT&T SIM card. I don't need an active card, just needed so that I can get past the activation screen of my iPhone 5S.

Most wireless kiosks in the malls have SIM cards available, or try a kiosk that does unlocking - they have a host of SIM cards lying around.

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