Alternate ZP purchase Methods~

I've purchased ZP with those 20$ Ultimate Game Cards, but then I realized I waste 1.50$ everytime I purchase one. Is there a way that I can use every single cent on the UGC?
I don't want to more money to be wasted everytime I buy more~

Or are there any other ways of buying ZP effectively?

I can't use credit cards or SMS method cause I'm not old enough.

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