That's what I do, Matt. It's also better for the fish - and more natural, to boot.
In addition to that; another great cost saver is to buy "whatever" "whenever it's on sale." (Or when people get out of the hobby, or whatever) This way I get a wide variety of a wide assortment of different foods, different sizes and shapes - and a varied diet. That, plus anything I find outside - worms, slugs, snails, other "bugs" and even leftover human foods. This gives fish a good well-rounded, mixed, more "natural" diet.
Mods - thanks for reeling things in - no need for putting down people who may or may not know a little less about something or other.