You might do a websearch for Dicentra exima 'Stuart Boothman' or 'Boothman's Variety'. I saw a few nurseries offering them, but did not recognize the names. There once was a PACNW variety available, Dicentra formosana 'Snowflakes', but haven't seen it offered in some time. It did not survive in my climate.
For unknown(to me) reasons, the white flowered one's seem more fragile than the common pink flowered ones, which will grow in almost any soil type and exposure, I have a huge clump(and getting larger) of those that came from naturally propagated seed, thrives in full afternoon sun and seems to be extremely drought tolerant. It also blooms from early spring until late fall.
Be sure to check out any nursery at Dave's GardenWatchDog before ordering!

Dicentra 'Stuart Boothman' (or 'Boothman's Variety') is a pink flowering form with a silver cast to the foliage, so that's not going to help :-) Dicentra 'Aurora' seems to be the most commonly available white flowering form of fernleaf dicentra and a good many mail order nurseries offer it. btw, despite the labelling below to the contrary, 'Aurora' is a named form of the western bleeding heart, Dicentra formosa, not Dicentra eximia.

In my garden, the white fernleaf is a much more aggressive spreader than the pink or red forms (I grow several) and rogue plants pop up all over.

Here is a link that might be useful: source for 'Aurora'

I have grown these for years and they are white.

Here is a link that might be useful: Dicentra exima 'Boothman's Variety'

Thank you both. I will check into these varieties right away.

I have a ton of them. where in NYS are you?

I am in a little place called Ballston Lake. It is south of Saratoga Springs. Where are you?

georgia-rose, you obviously interpret colors differently than I :-) There is a lot of pink in that flower and even your link indicates flower color ranging from deep to medium pink. A Google image search will show flowers in various tones of pink, not white. And while this is true of 'Boothman's Variety', a seedling strain, plants of 'Stuart Boothman' are characterized by very glaucous, grey-green foliage, highly dissected, and consistently rather intense pink flowers. Regardless, neither are considered white forms of dicentra and certainly do not offer the pure white, without a hint of pink, flowers of 'Aurora'.

btw, I too have grown 'Stuart Boothman' for many years and this is what it looks like in my garden:

Here is a link that might be useful: Dicentra 'Stuart Boothman'