http://m.ikea.com/us/en/catalog/systems/10364/11465/11703/
I use the Ikea IVAR system. Adjustable, sturdy and no sagging. It us solid pine and finishes easily if you want. I used a quick coat of shellac to finish mine. Oh, cheap too. I use the 12 inch wide shelves for records as that gives me dividers every foot. They are 2 depths: 12 and 18 inches. Perfect!
I use the Ikea IVAR system. Adjustable, sturdy and no sagging. It us solid pine and finishes easily if you want. I used a quick coat of shellac to finish mine. Oh, cheap too. I use the 12 inch wide shelves for records as that gives me dividers every foot. They are 2 depths: 12 and 18 inches. Perfect!