How much is a Cypriot euro worth?

As capital controls in Cyprus are to kick in, and most remain sceptical that they'll last just a week, many are scrabbling to determine a method of assessing the value of the Cypriot euro. The euro in Cyprus is no longer worth the same as a euro in Germany, as Cypriots can not use their euros there freely. While Cyprus may not have formally left the euro, it is only a matter of time that it does or the euros will simply leave Cyprus when capital controls are loosened.

So what can be done? Suggestions below.

Reuters' Felix Salmon:

UBS' Donovan: