Remembrance Poppies are available in France but not widely. Your best starting point is the Bordeaux branch who should be able to give you details of your nearest location (this should now cover Creuse).
The Royal British Legion Bordeaux and SW France Branch
4 Grand Pré, 33790 Pellegrue
Phone/fax 05 56 61 40 64
You can also buy a poppy pin online from the Royal British Legion Poppy Shop