Many available. Some include:
'Cherry Ruffles' 18-24 inches tall, medium size red flowers
'Dreamland Mix' 8-10 inches tall, mix colors, large flowers on compact plants
'Magellan Series' 10-14 inches tall, pink flowers,
'Purple Dahlia' 3-5 feet tall, large flowers
'Envy' 18-24 inches tall, green flowers
'Zowie Yellow Flame' 18-24 inches tall, yellow flowers with red markings
'Zahara' Series, 12-18 inches tall, many colors, good disease tolerance
For dependable, low maintenance zinnias resistant to powdery mildew, consider using Zinnia angustifolia cultivars. They produce numerous single flowers on compact spreading plants. They include: 'Crystal White' 10-14 inches tall, white flowers; Crystal Orange 10-14 inches tall, orange flowers; 'Star Orange' 10-14 inches tall, orange flowers; 'Star White' 10-14 inches tall , white flowers. The 'Profusion' Series, Zinnia hybrida also are excellent choices for disease tolerant zinnias.
Deadhead for continuous bloom.