Now that the big harvest is over, Mason jars are hard to come by. When you do find them, they are a bit more pricey than when you bought them back in the summer (unless, of course, you got them at clearance prices at the end of the summer or from a garage sale or friend). In any event, you can obtain jars for FREE from the grocery store by scouting for goods sold in these gems. Okay, so they aren't free, but it's like getting them for free if you have a need for the goods sold inside of them anyway. For example, at Walmart the store brand salsa is bottled in a Mason jar that accepts a regular size canning lid (but not the ring). After you empty the contents, you can use these jars to vacuum seal your leftover Halloween candy! Or maybe store some rice, pasta, or raisins. The possibilities are limitless! Note: The threads do not line up correctly with the rings to use them for traditional canning (water bath or pressure).