We here at The Crislers love to save money. I appreciate a good money-saving tip, and I came across one we have consistently used for about the past six months.
See those tall green spears in the Ball jar? (Not the red pot- that contains aloe vera, which we chop off to slather on burns- another money saver!)
Those are green onions. It turns out, after you buy a bunch at the grocery store and have chopped off all the green part of the onion, all you have to do is fill a jar with water, stick what's left in, and they re-grow like crazy. I had these all cut down to the white part about six days ago, and nearly a week later, they've nearly grown back up to their original height.
I would recommend you change out the water every few days, and you'll need to trim the roots every couple weeks, lest they get all slimy and gross.
Unless you're a super-enthusiastic green onion lover, this may not save you a fortune, but every little bit helps, right?