This item is priced by the sq ft.
Take the width and multiply it by the height of you banner measured in feet.
Sample: 4ft wide x 2ft height = 8sq ft
 
Take the sq ft and put it in the quantity of this item.
Sample: Quantity 8
 
If you need more than one banner, multiply the sq ft times the number of banners you need and mention this in your order notes.
Sample:
Need 5 banners in the same size.
8sq ft x 5 banners needed = 40 
40 = final quantity
 
Price includes printing cost only.  If you need your banner designed as well please add the appropriate artwork fee.