1-dodecanol is not offered in liquid format only. This product , along with product 126799 and W261718, consists of a "Solid or Liquid" specification. The melting point of the product (mp 22-26 °C (lit.) is around room temperature - the ambient temperature will influence whether or not this product will be in its solid or liquid form. That is why the specification lists the form as either solid or liquid.
In order to ensure you receive a lot with the "Liquid" specification result, please contact Technical Service as they can view the batch material in stock and see the appearance specification results per batch. Please navigate to the link https://www.sigmaaldrich.com/techservice, click on "Product Technical Inquiries" under the Products Section with all the required information so that a member of Technical Service can reach out to you to assist further. Thank you.