Dock is a 15v-enabled HDMI dock with USB-PD charging and USB3 support. Cheapest commercially available equivalent is ~150-200 USD. Nintendo sells it for ~60, which is much less.
I don't mean to be rude, but that's total nonsense and babble. Most of the circuitry is already in the Switch itself (charging circuit, all of the video chips, USB controller etc.) or the power adapter (transformer, voltage regulator, smoothing capacitors etc.), the dock contains a USB hub controller which costs pennies, a MyDP-to-HDMI converter which is equally cheap and a handful of CMOS and other smaller, insignificant chips. The dock doesn't do anything important at all, the video and audio signals are encoded by the console already. The charging is also handled internally, otherwise the system wouldn't be rechargeable without the dock. The dock is "15V-ready" because it's connected to a 15V power supply, that's it. It serves as an adapter and splitter, nothing more. $13 says you're grossly overestimating its value.
Dock Teardown showing that there's nothing of interest or value in there:
https://www.ifixit.com/Teardown/Nintendo+Switch+Teardown/78263#s156439
MyDP to HDMI adapter with a USB charge plug. $13. Bang:
https://www.amazon.com/gp/aw/d/B01FW74CQS/
The plug seems large because it contains *all of the circuitry* required to do the job. Yes, it's in the plug.
Here's another one. $29, just plug in that wall charger and you're set. This one's 4K-ready, too:
https://www.amazon.com/gp/aw/d/B015DJ4QYI/
This one's $10. How low do you think we can go?
https://www.amazon.com/gp/aw/d/B00GU4QV2G/
There's zillions of those things out there and they're all cheap as dirt. I don't know where you're pulling your figures from. If the guts cost around $10, you're paying $80 for a bunch of, frankly, low quality plastic.
In the European region retailers have plenty of Switch units available. That said, websites (generally from UK), don't take Switch "deals" too well because they're being sold at full price so it's a legitimate reason to receive criticism. The only Switch stuff that's available at discount are accessories, like, glass tempered screen protector, silicone cases, grips, stands, cases and so on on eBay.
Huge shortages where I live. There are weekly drops of units that disappear within a day or two and scalpers, that's the only two avenues to get a system.