Home Depot offers the Furinno Boyate Five Wall-Mounted Shelf in Walnut for $14.54. Choose in-store pickup to avoid the $7.49 shipping fee. (Amazon charges the same with free shipping for Prime members.) That's tied with our mention from last month and the lowest price we could find by $12. It measures 6" x 14" x 36".

Update: It's sold out at Home Depot, but still available at Amazon for the same price.