Have you tried White Flower's website?

https://www.whiteflowerfarm.com/dahlia-flowers

I did a search and saw that you have asked this same questions a couple of different places. - For future reference, if there is any variety of plant that you are looking for and want it in your garden, don't wait until the end of March, it is almost a guarantee that it will be sold out for the season. Swan Island Dahlias puts out its new list of dahlias for sale in January - or earlier - and the choicest varieties always go first. Or at least the varieties you are looking for. it seems!

Gardenweb is not a site to sell plants from. I am pretty sure it is against all of the rules here. If you can find someone that grows this variety and is willing to share no charge, that's another story. Good luck with your search!

perhaps you have luck with this serach site, and otherwise, try local Dahlia societies or next season...

https://dahliaaddict.com/china-doll/dahlia/620?view=results