Antonyms for the phrase "are on hand" could be "not available," "out of reach," "unattainable," or "scanty." When something is said to be "on hand," it means that it is easily accessible and available for use. If the opposite is true and something is "not available," then it is not within reach or cannot be used at that moment. Similarly, "out of reach" implies that something is physically too far away to be obtained, while "unattainable" suggests that something is not possible to achieve or obtain. Finally, "scanty" means that there is not enough of something to be considered readily available.