I like to do stuff like that - green onions, spinach whatever. Makes it easy to do a quick soup or stir fry.
Well, if you consider that what you actually have is “organic” green onions, the savings is a bit more and usually the taste is even better when it’s home grown, put up quickly, and has more nutrients to boot.
True they do taste better than store bought. I also like to take my fresh basil, fine chop it and fill up a quart ziploc freezer bag, loosely full. I add olive oil about 1/3 cup. Close up bag and squish everything good so all the basil is oil coated. Then open the bag a bit, press the air out and seal and freeze flat. If I make pizza or pasta and want some “fresh basil” I just open the bag, break off what I want and seal up again. Works great.