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The Home Design Products Mega Shelf 4-Shelf Plastic Shelving Unit is $19.88 at HomeDepot.com. This is a price low for a unit this size, even with $9.39 shipping, and it ships free with an order of $45 or more. Store pickup is also free. Shelving unit measures 18" D x 36" W x 55" H and holds 500 lbs. Sales tax is charged in most states