Yeah, they can use up a lot of yarn. You might have to try a Walmart, or Hobby Lobby type store and pick up a few. Some of the yarn you're using looks like Red Heart Super Saver in a worsted weight. That's an inexpensive yarn with a lot of yardage and is probably the best weight to use on your machine. Any yarn in worsted weight would work if something is on sale.
I also suggest you stick to one yarn weight per project. Mixing weights will affect the outcome. And of you use a lighter weight or heavier weight it will also affect the size.