How to return something to Taiwan with a tracking number?

I bought a computer-related tiem on Ebay from a seller in Taiwan and it doesn't work. We're in the middle of a Paypal dispute. Paypal says to return the item using a method with a tracking number. It's a $50 item, so I'm wondering if there's some cost-effective method of shipping it back?
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``https://ebay.us/m/KxolR5
<< <i>It's probably time to cut your losses and move on. >>
That's what I figured, but never hurts to ask.