Bolian crystalsteel

From Memory Alpha, the free Star Trek reference

Bolian crystalsteel is considered collectible merchandise in the retail markets of the 24th century, not easily acquired in the Bajor sector.

In late 2370, Quark listed Bolian crystalsteel as a plausible item that he could sell over the monitors on board of Deep Space 9 if given permission by Commander Benjamin Sisko.

Including the crystalsteel, other collectibles Quark listed that he could sell at a significant discount included Andorian jewelry and Vulcan Idic pins. (DS9: "The Jem'Hadar")