This kit is a superb way to get started with indigo dyeing, and includes indigo and all the reagents you need.  
 
This is called the “1, 2, 3 vat” – it is a cold vat that is great for cellulose and some silks; however, it is not recommended for wool because of the iron. The Ferrous Vat gives a beautiful dark indigo and has the advantage of being a cold vat that keeps for months.
 
This vat is reduced with ferrous sulfate and is sometimes known as a 'ferrous vat'.  This kit contains 50g natural indigo, 100g ferrous sulfate (iron), 100g Calcium hydroxide & instructions