For my mini-farm, I use these https://www.amazon.com/AmazonBasics-5-Shelf-Shelving-Casters-Black/dp/B0727YYPR2/ref=sr_1_1_sspa?ie=UTF8&qid=1527908289&sr=8-1-spons&keywords=metal%2Bshelves&th=1 and they work perfectly for my needs