I saw some a few hours ago at the little convenience store at the corner of Mount Pleasant ave and Chalkstone in Providence. Cannot think of the name but it is bright yellow and red exterior. They even have a little parking lot.
There is also a Middle Eastern grocery on Mineral Spring in the area of Paulie Penta's deli. You could also try the Indian spice shop on Hope Street across from Not Just Snacks. I think it is called Not Just Spices.