This is the distributor website Which they publish the entire catalog for (unlike some others). If you are a distributor, there actually is a buy button on the same page.

You can get them at mouser, digikey, and a million other places.

Seriously, this is not hard.

Let's take the first thing on the page. Part number 6ED10521CC080BA2.

Let's shove it into octopart: https://octopart.com/search?q=6ED10521CC080BA2&currency=USD&...

Let's see: distrelec, mouser, tme, etc.

You really seem to be making this out to be hard and it's super easy.

Siemens PLC stuff is really really easy to get.

I can't name a single PLC thing i could not get shipped to me overnight, from RS or mouser, without talking to anyone.

The only thing that requires actually talking to siemens is some of the CNC stuff, and there, it took me 1 day to set up an account and i just email them PO's, they auto-send me ship dates within an hour, and they invoice me later.

So even that is not like "this person tries to hard sell you on stuff". Heck, I sent them a PO today for 90 laser-inscribable keycaps for a machine control panel, not exactly a high value item. They are happy to do it.

Now, i happen to live near automationdirect, and their stuff is quite nice for simple things, but if you are integrating into the siemens ecosystem, it's just not that tricky to get stuff.