Empty box in screed with flap and cable gland

Good morning everyone,

I am looking for an empty box for the screed, into which I can insert 2 empty conduits (for possibly HDMI, network or power). Unfortunately, I only find regular sockets for floor installation and if I find anything, it is not under €150...

Does anyone maybe have a tip?

The stuff is so expensive. We also planned a floor box for power and network in one place. The electrician wanted over €400. In fact, the component itself already cost over €300 online. So it was reasonable (metal, flush cover, etc).

So again, yes, the stuff is so expensive.

okay then I have to come up with some kind of makeshift solution. I'm not paying that...^^