What's a good alternative to the IKEA Billy bookcase?

Across community threads, the Sauder Select line is the most frequently cited Billy alternative, with one r/Hamilton commenter saying their Sauder held up 'far better than the Billy.' Industrial metal-and-wood etagere styles from brands like Tribesigns and Shintenchi are also popular for an open, non-IKEA look, though they trade closed-back rigidity for a more decorative profile.