Years ago I dealt with Lamb's Rock Garden Nursery near Spokane. They sold a white form and a pink. The company seemed to disappear.

White and pink flowered forms do exist....they are just not very common and tend not to be as vigorous as the blue flowered forms. Look for 'Alba' (white) or 'Rubra'/'Rosea' or 'Pink Elf' for pink versions.

Thanks! I will look around for them.