To check all Item Prices together, go to:

Stock > Item Price Stock under Stock Reports

When you open Item Price Stock page you will see all Item information including Item Code, Item Name, Brand, Warehouse, Stock Available, Buying Price List, Buying Rate, Selling Price List and Selling Rate.

Using the 'Set Chart' button, you can set values for the X and Y fields, use different type of charts and select a color.

After setting chart you can see the result as shown below

Visit the Item Price page to know more