Joy Creek Nursery has them...

Forest Farm also carries them.

We planted 6 just last month. I purchased them at Lowe's last fall and kept them in their 5 gal pots over the winter. They are covered in leaves and are beginning to show their first snowy blooms. They are planted in partial shade with good drainage. We also planted 3 arrowwood (?) viburnum in full sun.

This is my first experience with viburnum and they're all doing very well.

~Mary