“IF you have a soup or stock-pot deep enough to hold the jars AND about 1-2 inches of water above them AND space to keep it from boiling over.”
That’s the problem, I don’t have that. I have one tall pot but it would only hold maybe three pints or quarts, maybe it would hold four but I doubt it. The water bath container with lid and rack/lifter is $19 on Amazon - that is their best seller for a water bath. It’s the pressure cooker that costs a good deal more money.
Sometimes local stores and online sites have good sales after the season ends. Just keep an eye out.