I seen it for sale in my local party store? What does it do?

Salvia divinorum, also known as Diviner's Sage, Magic Mint, ska Mar铆a Pastora, Sally D, or simply Salvia (although the genus name is shared among many plants), is a powerful psychoactive plant, a member of the sage genus and the Lamiaceae (mint) family. It has long been used as an entheogen by the indigenous Mazatec shamans for healing during spirit journeys. The plant is found in isolated, shaded and moist plots in Oaxaca, Mexico. It is thought to be a cultigen.

There's a lot more info on this.

The Latin name Salvia divinorum literally translates to "Sage of the seers".[6] The genus name Salvia is derived from the Latin salvare, meaning "to heal" or "to save".[7] The primary psychoactive constituent is a diterpenoid known as salvinorin A.[8][9]