My use case is for printing client proposals and estimates. Since Coda has limited currency options and custom values are not allowed, this is my workaround for using my local currency.
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Install the Find & Replace Chrome Extension
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Format your column as a currency with the $ Symbol.
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Use the find & replace tool to change the currency to what you need.
Note: If you refresh the page or update the table this will revert to the $ symbol. But it is useful if you need a custom currency symbol for printing only.