Try www.xe.com - it's a very easy to use and up to the minute money conversion website. On the home page you just type in the amount, select the countries you're interested in comparing and voila! The conversion is displayed to (I think) 6 decimal places!
ex.com dont give you cash theyre only for transfering large amounts to a bank account .so not as useful as they first seem.
check m&s online as they actually give the cash out
people get misled by the xe calculator you can calculate on m&s site and they actually pay that to you no commission etc .and a wide range of stores for collecting it too.