I noted some cheap probes today on the auction site-- they are unbranded P6150-- and they
appear to match the specs of the original probes. However, I also did some digging here in the forum posts... and found a mention of the P6150 probes in an apparently-deleted thread about "cheap POS 'scope probes on EBay" which I wasn't able to read. It seems to say that they are not even 100 MHz.
https://www.eevblog.com/forum/testgear/pos-ebay-'scope-probes/ Edit: Not sure why that didn't work initially, but I have since been able to access that thread via direct forum search. Strange.
Does anyone have any actual experience with the P6150 models? Good, bad, ugly? I imagine they're just a 150 MHz version of the P6100's. These would be a temporary, and (later) auxiliary fix while I get this thing up and running-- I'll get the genuine Tek probes down the road when I can make it fit my budget-- but I need something to run this scope through its paces ASAP to see what sort of rabbit hole I've gotten into.