Walmart offers the Spectrum Somerset Expandable Shelf [walmart.com]
in Satin Nickel for $5.66. Opt for in-store pickup to dodge the $5.99 shipping fee.
Product Info (provided by Walmart):
Maximize your cupboard space with Spectrum's Somerset Expandable Shelf. This versatile shelf doubles your storage space and creates easy access to your frequently used kitchen, pantry or bathroom items. Accommodates up to 11-inch dinner plates to be stored underneath. Made of sturdy steel, this shelf expands up to 22-5/8 inches wide to custom fit to your cabinet width.
Spectrum Somerset Expandable Shelf, Expands to 22-1/4", Satin Nickel PC:
Doubles your storage space
Accommodates up to 11" dinner plates to be stored underneath
Expands up to 22-5/8" wide
Made of sturdy steel
Dimensions: 12.5"L x 10.5"W x 5.5"H