I have just noticed a boot sale, Vide Grenier coming up in Guémène-Penfao(44) on the 1st May at the Salle Bellevue.
It is estimated that there will be 100 places, so hopefully should be a good one if the weather is nice.
It is open from 7am till 6pm. If you want to reserve a place then telephone 02.40.79.21.40