Building materials - Luxembourg

[MarkDLxu]

Hello everyone,
I'm new to the forum and I've just completed the concrete slab for my future pizza oven.

I live in Luxembourg and there's not so much choice where to buy this materials ( refractory bricks and tiles, CalSil board, Ceramic fiber blanket.. ), or, if any, are really expensive.

Is anyone of you living nearby that could suggest me some suppliers abroad with delivery options?
Maybe Belgium, Netherlands, Northern France or West Germany.

Any suggestion is appreciated,
Thanks
Marco