There is no membership or start-up fee. You can buy a months worth of classes at a time, or just one at a time. Most student estimate how many times a week they will go in a month, and buy the appropriate amount. Usually, the more classes you buy at a time, the less it cost per class. Because Jazzercise classes are independently owned by individual instructors, there is no set rate.
Many instructors offer a special rate for new students on their first purchase.
Any loose, comfortable clothes are fine. Most people wear a leotard and tights, or shorts and a T-shirt. Bring along a towel or exercise mat for the floor work. Good, rubber-soled aerobic shoes are recommended. Registration is ongoing on a drop-in basis.