I bought my from
www.models-mart.com and I chose Scuba model, it has 20 pages and is good for 40 images. The cover looks and feels like leather, but the comany claims it's more durable. There must some truth to it because I had mine for years and it doesn't show any signs of aging. I know several people who also use the same portfolio with satisfaction. Take a look at their site:
http://www.models-mart.com/
Laura aka Michelle on Water Island US V.I. In the background is St.Thomas