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.
Hog Mountain Brewing Co.
Keg 1: Hog Mountain Pal Ale - Tap 1
Keg 2: American Wheat - Tap 2
Keg 3: Dunkelweizen - Tap 3
On Deck: Bourbon Barrel Porter (to be aged 6-9mos in brand new 1L flip-top bottles) and Pliny the Elder!
"Always do sober what you said you'd do drunk. That will teach you to keep your mouth shut."