You can order Ball Mason Jars as low as $7 per case at Ace Hardware. This price is for the pint size. The case includes 12 jars so only $.58 each.
If you prefer the wide mouth jars, grab the quart size for $10. This also includes 12 jars so just $.83 each. I like the wide mouth jars because they are so easy to clean. This is also great for salads and such.
Click here to order from Ace Hardware. The sale runs through the end of the month but sometimes they do go out of stock sooner. Shipping is free with in store pickup.