Which word describes something that is fit or able to be sold?

The term "salable" is used to describe something that is suitable for sale or able to be marketed effectively. This word indicates that the item not only can be sold but also meets certain criteria that make it appealing or viable for potential buyers. Factors affecting whether something is salable can include condition, demand, and marketability.

In contrast, the other terms provided do not carry the same specific connotation regarding salesability. For example, "barterable" refers to items that can be exchanged directly for other goods or services without using money. "Disposable" pertains to items designed for one-time use or that can be discarded after use, lacking a focus on their saleability. Lastly, "usable" signifies that an item can be used for its intended purpose, but it does not imply that the item is fit for sale. Therefore, "salable" is the precise term that correctly indicates an item's fitness to be sold.