One of the best resources out there for finding sellers or varieties is
www.dahliaaddict.com

It has been run by a lady that is obsessed with spreadsheets and dahlias, to the delight of us all. Wonderful site, kept up to date as of this posting.

I checked a composite classification spreadsheet, and found two Donna
Marie's. One is a BB, Informal Decorative, Red, by the name of Donna
Marie, and the other is a Stellar form, flame colored, by the name of
Verrone's
Donna Marie. Currently, the first DM is not being offered for sale, but that might change after Thanksgiving, when most sellers know what their stock availability is after completing their digging/storage for the year.

I suspect your Sarah May is actually Sarah Mae, an A, incurved cactus and dark pink. Here's mine when I grew it years ago... (sorry about the blown-out color) This is an oldie that is often available. I was thinking about picking it up again in a trade this year... kinda miss seeing it in my garden.

Thank you so much