Lilies: Help finding Martagon bulbs, 1 by Cibarius

Cibarius wrote:
Here is a photo of my planting hole for lilies. You can see how I am preparing for drainage. The bottom of the hole will be filled with sand and a light, aged mulch. Above that will be a thick layer of prepared flower soil. The platformed part is an existing plant of Asclepias tuberosa that I did not want to transplant.

I am trying to find a source for Lilium duchartrei bulbs or any similar white Martagon lily.

Can anyone help me?