Most people stumbling into Sparklegem's Shop of Wonders pause in confusion. Did I not just walk into a narrow shop between two houses? Wasn't this a tent on the outside? The confusion is understandable when one realises that the shop is a demiplane, and the doorway or tent flap was a portal between the Material Plane and there.
Sparklegem's Shop of Wonders appears as needed, sometimes hiding in plain sight, other times an eyesore on an otherwise unblemished landscape. Travelling across the multiverse, the gnomish sorcerer (and Snowfeather, his snowy owl familiar) is happy to buy, sell, and trade in magical items and gold. Soul coins are not legal tender, even when the shop appears within the Wandering Emporium.
Sparklegem's Magical Collection contains twenty-one items that Sparklegem or his patrons have traded along the way. Nothing here would seem out of place in Faerûn, Ravnica or Eberron, although the design of these items may appear outlandish in another realm. When asked about their origins, the gnome goes off, muttering about the quirkiness of Meletian philosophy or the stifling heat of Port Nyanzaru, without clearly answering the question.
- from the publisher's blurb