I put an ad on Craigslist a couple weeks ago that said I was looking for canning jars, dirty or clean I would take them. I had someone answer the ad this morning saying that he had a couple dozen and left me his phone number. I called and left a message and he returned my call and my husband and I made arrangements to go pick them up. We went and picked up for FREE 5 DOZEN PINTS and 5 DOZEN QUARTS and 3 half pint canning jars. He also asked if I wanted any "mayo" type jars and I said sure. He gave me about a dozen of them. I have used "mayo" type jars many times when I water bath something but never in the pressure canner. Right now I have such a huge amount of "real" canning jars I don't need the "mayo" type but the Amish where we go to in Cuba Il would take them. Right now I have about 20 dozen "mayo" type jars we are taking down to them next Saturday. I would rather take them to someone than to see them in the landfill.
The gentleman we got the jars from goes to about 3 auctions a week and get jars all the time. He cans but only uses a certain Ball quart ball jar and the others he gives away. He asked if I would take more when he gets them and if they were dirty would I take them. Of course I said yes. I told him what I don't need I will take to the Amish and he was very happy with that. He said he would keep my number and only call when he has a nice amount to come and get. He buys certain items at auctions and then sells the stuff, this is how he makes his living.
The reason I put the ad out there was I had several people tell me that they had canning jars and couldn't find anyone to take them and threw them away. If you do this of course make sure you follow all safety precautions.