Hydrox cookies are not available for purchase as of January 2015. However, the owner of the trademark, Leaf Brands, has announced its intention to bring Hydrox cookies back to the market.
Hydrox cookies have been an American favorite since their debut in 1908, when they were made by Sunshine. The cookies inspired the creation of the Oreo sandwich cookie in 1912, although the Hydrox cookie is sometimes erroneously thought to be a copy of the Oreo product. The filling of the Oreo is slightly sweeter than Hydrox cookie filling, and an Oreo gets soggier when dipped in milk than its Hydrox counterpart.