Tea is easier to sell online as shipping is easier and the shelf life is much longer than coffee. There are lot of successful sellers of teas online. Chado's, David's Tea, Capital Teas, Tao's, Art of Teas, Teance.
Most of the sellers on sites like Amazon and Ebay sell similar leaves. If you try to sell
Online on your own site, be prepared to cough up lot of adword money for Google. Eaiser to sell on Amazon.