Research for portfolio's

After doing some research looking into prices and websites which supply portfolio's, i print screened each page which i was interested in being the product and the price so bellow you will find my research of a type of portfolio followed by the price:

This is a slipcase this is a fold out portfolio which slips into another sleeve.

this can be found at:http://www.silverprint.co.uk/ProductByGroup.asp?PrGrp=721

Here are the prices of the slipcase:

The next type of portfolio is called the prat books again you will find the product followed by the price, this can be found at:http://www.silverprint.co.uk/ProductByGroup.asp?PrGrp=722

Here are the prices for the prat book:

And the last type of portfolio i found was a genuine leather A3 portfolio here is the item and again you will find the prices bellow.

This item can be found at:http://www.silverprint.co.uk/ProductByGroup.asp?PrGrp=724

And again bellow you will find the price for this item: