I think you mis -spoke (-wrote) here:
FreedoK is a bit more expensive then your usual Pills.
I consider none of these boards "expensive".
In US language, "cheap" seems to be a curse word, as some connotation between low price and low quality, and that is exactly what the average "Blue Pill" board has become. Quality has deteriorated that I would not accept the USD1.5 boards if someone gave them to me for free.
[Edit:] Clarification: Figuering out which of the "clone" chips it is, because the type number has been erased and reprinted as "STM", or even if it has one of the 8 other type numbers on it, and then trying to keep track of the incompatibilities costs more of my time than the USD1.5 price of these boards. With the Robotdyn boards you can be reasonably sure it's a real STM part (if you buy the second cheapest they have), and that is well worth the extra money to me.
Other quality issues are the mediocre PCB layout. I have not used the ADC yet, but apparently you can get 8 or 9 "true" bits out of the 12 bit ADC. and over 11 true bits if you have a good PCB layout.
I had a look at
http://vcc-gnd.com/Not much language I can understand there, the shop redirects to taobao, which is a bridge too far for me, and on top of that, I find the stuttering and moving background annoying.
Also had a look at FeedoK:
https://www.aliexpress.com/store/group/STM32/5565045_518691931.htmlCould be interesting if you want a particular chip (they have 50+ variants), but for prices between USD7 and USD14, it adds a bit up if you want to buy a few handfuls for "generic" projects.
Robotdyn still seems to be the best choice for me. Very reasonable prices (Around USD 3.5) with a promise to have real STM chips and they have some affiliate connection with (almost) local shops here in the EU (And also on other parts of this world).