I'm assembling an Amazon order for a bunch of stuff to start my build
I'll be starting with a single Auber 2352 PID and a single temperature probe in the kettle
I see Kal recommends Auber PT100-L50M14 but Amazon doesn't carry that.
Is there a good thermowell I can add to my order to put me over the bar to free shipping?
You probably don't want a thermowell (semantics), but an RTD probe such as the one you cited. That one, with an upgrade to the deluxe cable which includes a stainless braid and panel mount connections, gets good reviews on here.