Sometime between 5-10 years ago, IKEA US stores offered a 15 inch deep BILLY bookcase for a short time. Now, we really need a couple more shelves.
![38 Ikea Kallax Hacks and Ideas [2023 Update]](https://i.pinimg.com/originals/75/1f/77/751f77443e49e3dc65ee32f0a2ed2574.jpg)
