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Small variety store maybe sell voucher,you can try nearby corner stores. If still no available,you can ask your friend who can get it and you emt to your friends. Good luck 

I think the guy want to pay by cash. Online is not suitable for.

Go to IGA customer service,ask them you want to buy public mobile voucher. If they have,they will know how to do for you.

I am not sure，but you can go to other gas station，for example Mobile gas station. Of course,you also can to supermarket likes Metro.