Stand - alone shelves made of reinforced plastic (typically 4 ft wide, 6 ft high, and 20 inches deep) sell at local hardware stores for about $ 90. (moneysense.ca)
I walked into my favorite local hardware store and timed how long it took someone to ask if I needed help. (justagirlblog.com)
I wasn't able to find it at any of our four local hardware stores so I ordered this one online. (wellnessmama.com)