I was browsing Mandarake (the Japanese second-hand chain) looking at doll outfits the a few weeks ago when I came across a listing for a YoSD Tinatsu (also called Chinatsu, but I'll be using the former since it's what appears on her paperwork). While I debated buying her, she sold. But a few short days later another Tinatsu was listed, this one at 3000¥ less because her eyes had been swapped and were no longer the default brown. Since I can't resist a good deal, I decided to add her to my cart.
Unlike some of their larger dolls, there are no standard dolls in the Yo-SD size (26.5cm), so all of the releases have been limited run for the various Dolpas ("doll parties") and other events.