On Amazon right now you can get Traditional Medicinals Organic Echinacea Plus Tea, 16 Tea Bags (Pack of 6) for just $21.60 when you choose the Subscribe & Save Option. This works out to just $3.60 per box and shipping is free! This is my go-to tea when I am feeling sick and it really helps.
This will ship free with Amazon Prime or qualifies for free Super Saver Shipping with a $35 purchase.
Note: Amazon prices and promotions can change at any time. The price(s) listed in this post is/are subject to change.