Walmart discounts a selection of garage and storage rollbacks, with prices starting from $12.70. Choose in-store pickup to avoid the $5.99 shipping fee, or get free shipping on orders of $35 or more. (Oversized items may have additional fees.) A couple of best bets:

SystemBuild Apollo Wall Cabinet for $39 (low by $9)

Muscle Rack 48x48" Adjustable Ceiling Shelving Unit for $54 (pictured, low by $18)