<br />
 I have never used them, but according to Carnival&#39;s website:<br />
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What are Carnival &quot;Funship&quot; Dollars? <br />
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Funship Dollars come in denominations of: &#036;25 - &#036;50 - &#036;100 - &#036;200 - &#036;500.  <br />
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Funship Dollars can be redeemed against the cost of a cruise (as payment).  <br />
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Funship Dollars can be applied as an on board credit on the Guest&#39;s Sail and Sign account. <br />
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Hope this helps.