Limit 2
I have been debating all week if I would list this dahlia or not. High up there unicorn status currently and for good reason- very full, petal heavy, peachy, 4-5.5" blooms.
I grew one plant last season and it actually made a lot of tubers (longish and thin I guess is the norm for her), while im saving most to plant again there's a little more than I need.
The caveat- she had yellowish leaves. Sometimes this can be a sign of virus but not always; no patterns in the leaves at all- no mosaic pattern or circular pattern. The one plant had no distortion or stunting, which can be viral (actually it rivaled BQ York for height, very tall). Just yellowish leaves.  I will be closely watching the multiples I will be replanting, often a new growing year can answer questions. Maybe it was where I had planted it....a quickly turned over bed that had not gotten winter cover crop . Offering a few tubers at a lower rate but your risk....
While I do NOT guarantee any dahlias for virus and I do not test, lesser varieties I would normally dump my extra if there was any question.