Mrs. T, there are so many dahlias out there, and honestly, this one you have fallen in love with could be one of many named varieties, or a no-name dutch type sold in random packs. May I suggest you look at what is offered currently by dahlia vendors, and choose several that appeal to you?

Here is a preliminary search I started for you, based on the colors 'pink' & 'dark pink,' and the forms 'informal decorative' & 'waterlily' in the sizes 'small' & 'mini.' the DahliaAddict site has lots of resources, including this year's specialty vendors and search functions. It's worth spending time here, and exploring the thousands of dahlia options.

Dahlia Addict site ISO pink small dahlia
Dahlia Addict suppliers list