If you take out the spiral and you don't want a metal one back in again, you can take the whole kit-n-kaboodle to an office supply store, OfficeMax, Staples, Office Depot, (maybe even a UPS Store, ask Kat, she might know), Kinkos, etc. Ask them to put a plastic spiral binding on it.
...these plastic spiral bindings work great too for binding kids artwork etc also. I do one "book" a year for each of the kids artwork pieces. About twenty papers all bound together, we make a cover (they decorate) that includes the year and child's name. For stability you can have the front and back covers laminated.