Walmart has Better Homes & Gardens H Shelf Cube Organizer Insert, White Texture for $9.94. Shipping is usually free to Walmart+ members or on orders over $35.

About this product:

Unlock the full potential of cube storage with the Better Homes & Gardens H Shelf Cube Organizer Insert and the rest of Better Homes & Gardens’ line of cube organizer accessories and inserts. The H divider is designed to fit seamlessly into Better Homes & Gardens Cube Storage Organizer (sold separately) compartments. Effortlessly divide a cube shelf, horizontally or vertically, into two functional sections, to make the most of every inch of available space.