I’ve been trying to find these for a while and haven’t been able to find them for the last couple years. They used to be sold in Carrefour.
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https://www.sunnvill.com/index.php/銷售據點/國內
By the way… what is the use case? I understand you are single… in German we would call that kind of drink “Büchsenöffner” 
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May I suggest the following item then? Available in carrefour, and indefinitely more exotic:
I did that one already.
Family didn’t like it.
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Damn, where is urbandictionary.de when you need it.
Hmmm… how to say put this… let’s say “opening up the way to a happy ending with a female companion” 
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Well… it is a wedding and my cousin’s friends are cute…
I might need to stock up on more can openers.
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Notice from an older gentleman: “can opener” is a dick move, not a long term sustainable strategy.
But seriously: best idea might be check with the manufacturer. And if you look for other interesting things to bring (in case you didn’t try yet): Tea Flowers. Not Taiwanese originally, but exotic and not too expensive in Taiwan.
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