$2.80
Despite its rather prominent role in tie-dye, Rit Dye remains a vibrant staple of the DIY world even today. See their color formula guide for directions on how to create 500+ shades from Rit's standard range of 26 colors.
Rit Dye works best in the washing machine, but can be mixed easily in anything as small as a glass jar with warm water and a bit of salt. Each box contains 1 1/8 ounces (319 grams) of powder.