Home & Garden
As far as I can tell by the time you have paid to ship it, with all that weight, it will be way cheaper to buy in France.
As to the quality the board here is BA13 as as most of the stuff in England is made by LaFarge, a French company, quality should be the same.
Best to just check the likes of Brico Cash, Depot, etc for cheapish prices or buy it from a proper builders merchant like Guibout, Reseau Pro, etc.
2.5m x 1.2m x 12.5 mm thick plasterboards vary from 8 euros to 12 euros & most suppliers want approx 40 euros delivery . i asked my local merchant for his best price on 130 sheets & he knocked his down from 11.50 eur to 11 ! when i said 9 euros delivered i got the shrug LOL so i get them from bricomarche in vire but have to collect 30 at a time , 8euros there but no brand make & not as good as the knauf boards that my merchant was selling ( softer so guess less cement in them ? ) , you get what you pay for even with plasterboards
Prices here between €8 and €12 a sheet and the cheapest I have found in the Uk is €4 a sheet. Problem is at 10kg a sq mt then only 50 sheets is 1.5 ton so as someone pointed out transport cost is an issue unless you have your own vehicle.
We have regular trips to the Uk for family reasons and always come back with a van full of materials. Unfortunate reality is that "most" building materials in France are much more expensive.
I do find it a tad weird that the price differentials are so large especially when the 103 Brico Depot's & 106 Castorama's are British owned by the same (Kingfisher) company that owns B & Q and Screwfix....But I suppose the cost of doing business in France has a lot to do with it.