This Zumba DVD Set is the cheapest I've found, best of all comes with a beginners workout dvd with easy to follow dance moves.
Zumba Fitness Latin Aerobic Dance DVD Set includes:
1) ZUMBA BEGINNERS
Learn fun and easy steps of the Zumba moves
2) ZUMBA ADVANCED WORKOUT
Experience a total body workout with the rhythms and
moves of Salsa, Cumbia, Reggae
3) ZUMBA ABS, BUNS and THIGHS
Awesome workouts that combines the most effective exercise
and routines to tone your Abs, Buns and Thighs
4) ZUMBA POWER WORKOUT
ooh, free drink bottle!