Wen hair care products are sold exclusively online. It is against the company's wishes for Wen products to be sold in retail stores. If you find Wen products in a store, there is a good chance they are counterfeit.
According to the official Wen website, WenHairCare.com, the Wen hair products are available only online. The products are also the least expensive if ordered in a set from the official website.
Wen Products on Amazon.com
You can buy Wen hair products at Amazon.com, but they are more expensive than if purchased from the official Wen website.
Wen from Chaz Dean
The maker of the Wen hair care line, Chaz Dean, also carries the products on his website, ChazDean.com.