Kaneoh, last year or the year before, on nextdoor.com (has your neighbors on it), or facebook (if you have local people on it), we put up an ad for jars and came away with hundreds.
Many people have jars they don't use, in boxes in their basement from 'aunt dolly' who died, 'we cleaned out her house and put the jars in the basement'. Some people are getting too old to haul them out, some people don't want to run a rummage sale because it's too much trouble.
Our ad was something like, we'll come and get your jars, paying you 30 cents a qt, 25 cents a pint, and 20 cents for smaller jars. We hauled them up from basements in boxes from as long ago as the 1960's, newspapers included. We put in the ad we didn't want bigger jars than quarts and no antique jars, just usable ones for canning, no mayo containers. We also offered $10 for a pressure canner for our niece, and beginning canning supplies for her since she has kids and was just starting out.
We came away with antiques (for the same price, blue jars), a pressure canner, beginning canning supplies, hundreds of jars. 13 families called us and called us back with more and more. I have no doubt there are more in my area even now but we are stocked up on them. Make sure you have your name, and phone number available for future pick ups on jars. Families talk and there are more jars in their storage areas.
It takes a bit of time to answer all the responses, make maps to find their houses, set up times to pick them up, but it works.