Flush interior doors without visible frame?

We are looking for a supplier of flush interior doors without visible door frames with a good price/performance ratio for our new building. Do you have any recommendations for companies? Preferably also with the option to order online.

The material does not differ (in the same chip thickness). There are only three to four manufacturers in Germany anyway. The dealers usually sell at least two to three of them. The most important is the assembling company, that is, the one who installs and for flush-mounting even more so. And that is, of course, a regional matter. Maybe ask neighbors and acquaintances?

Thank you for the quick response. I mean flush interior door, as distinctions are sometimes made here as well.

I have already understood, that is what my answer was referring to.

I have mine from a carpenter - it looks very good;

I wonder if this is also available from [Fertigtürenherstellern]?

We looked at fully flush doors from the company Herholz today. The model is Piur U-Design. The price per door is about 1,400 euros plus installation, each about 700 euros.