You should try living in Ireland! Only a few stores in the Capital, and shipping to here is just crazy expensive. My sympathies on your current health and political crises. We are not doing well here either.
I remember reading of a historical incident. Some tropic Island was a Dutch colony. The islanders were unhappy with the Governor. They revolted and ate him.
I wrote a Primer on Measurement, it is here on the fora. It contains my views on the many mics available. However simply put, I see no point in buying one of these cheap mics without a Cal File.
As the Behringer example showed, the response can be wildly off especially at HF. Any Mic with a Cal File has gone through a post manufacturing process which both measures and corrects response variations.
The UMIK ships from Hong Kong but not at the moment. Dayton or Cross Spectrum Labs would be worth looking at.
If you or a friend does Recording, perhaps you can access an Omni Mic. Any decent brand will have close tolerances and a published curve which you can use to adjust your results.
Many of us use Mics like the DPA4060, an almost perfect Omni with no need for a Cal File because it is flat within a dB or so.