During the "Locked Mementos" quest, you will arrive in Hateno Village. While in Hateno Village, look on the path below the "modern" houses, next to Firly Pond, to find a black smoking statue. Talk to the Horned Statue to start a side quest. The statue will initially steal one heart container, but talk to it again to get the heart container back. Once you get the heart container/stamina vessel back, the statue will reveal all of its functions. Pray at the statue to get the option to "sell" your heart containers and/or stamina vessels for 100 rupees. You can then buy back a heart container or stamina vessel for 120 rupees.