The total cost including shipping is $21.20 to the US (ranging from $22.70 to $23.70 internationally). That is after the coupon code and including shipping.
The second cheapest place to buy is South Coast Shopping which, with shipping to the US, is $23.99.
Also, if you order other stuff at iherb (they carry all kinds of natural brands for health care, beauty, etc) they have $4 domestic flat rate shipping; and free over $60.
*I receive a 4% iherb credit when you use my code so thank you if you do!