Currency Converters - are they useful

Hi

can anybody recommend a decent currency converter to use on a commercial site?

Also are they worth using? or is it better to amend prices as required to 
take into account major fluctuations?

Basically I run a site for somebody who quotes in Stirling, US Dollars and 
Euros and if there are major changes in the exchange rate then prices need to 
be altered.

Thanks

Peter Hebdon - Web Master
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