Knifty Knitter looms are sold individually, or in sets. The sets of round looms and long looms each come with 4 looms. Each set also comes with a Knifty Knitter hook. Here are the loom sizes that you will be getting if you purchase the sets instead of the individual looms:
Provo Craft, the manufacturer of Knifty Knitter looms, also sells these looms individually. They also sell hat, mitten, and flower looms separately.