Look for the signs of "Bricorama" or "Mr Bricolage". They are the major DIY shops in France. Depends on how much you need. For just a few metres you could find it in a normal supermarket but otherwise..... Just found out, there is no Bricorama in Boulogne, but here's a link to Mr. Bricogite at 69 rue Faidherbe with the opening times.
bricoleurs.net/horaires-maga...
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not needed in the area but it seems most stores for that are in nearby St Martin de Boulogne
and Keria is my favorite for that in France
keria.com/details-store.php?...
hope it helps
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