I honestly can't answer your question, but I think many of the expensive probes are probably "cheap Chinese K-Type probes". I have always bought my probes from ThermoWorks. At least my Thermapen is made in the UK by nice Limey folk.
"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut."
I had a few of these, and they seem to work ok as thermocouples, however the spring for the cable as it goes into the thermocouple is not stainless. The ones I have rusted up in mild humidity. If you dont mind the outside parts rusting, they are a bargain. I have replaced mine with Auber thermocouples.
There are better things in life than alcohol, but alcohol makes up for not having them.