What will my total be on eBay.?

Ok so I bought an item on eBay. The price is 17.00 plus a 10.00 shipping charge. I usually pay using credit card, but that is not currently an option, so I thought about buying one of those prepaid cards. My question is, do I just put 27 dollars on the card, or should I put more on. Are there any hidden charges?
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