Fireworks are for sale in  South Dakota. Within the city limits of Sioux Falls the laws are a little stricter than in the rest of the state.

The City of Sioux Falls prohibits the use of fireworks within the city limits with the exception of sparklers, snakes and other fireworks that do not have an audible report, projectile or launching component. If a police officer observes fireworks being discharged, he or she can issue an immediate citation, which is a $95 fine. (City Of Sioux Falls)