You can get them on the ferries. Once in France, garages, hypermarkets etc. As usual, there's a premium for the ones on the ferry - DFDS on the Dover-Dunkirk run were charging £5.99 for a pack of 2, but AFAIK you'd normally reckon on paying between 1 and 2 euros in France. Recommendation is to buy two so that you always have a spare. But although the law comes in on 1st July, you won't get fined for not having them until the end of the year (November-ish). The fine is peanuts, around 10 euros.
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