Marks and Spencers always seem to have a good rate, but I think you need one of their Chargecards to order money - might not do if you go into a store with a bureux de change.
On a slight aside - What credit cards do the people who suggested just using them have as all mine have a surcharge for buying goods in another country and the rate of exchange isn't as good either.
I have: American Express Platinum, HSBC Gold Card, and an egg card. All of these have up to a 3% surcharge, plus the reduced ROE.
Sebastian.