Pearl of Power

Wondrous item, uncommon (requires attunement by a Spellcaster)

While this pearl is on your person, you can take a Magic action to regain one expended spell slot of level 3 or lower. Once you use the pearl, it can't be used again until the next dawn.

Worth around 400 gp, the 2024 value for an uncommon wondrous item. How item prices work

Pearl of Power is from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC, used under the Creative Commons Attribution 4.0 International License. Full attribution is on the Licenses & Attribution page.