Banner design in various sizes for ecommerce website

We have a commercial website that sells a wide range of products from electronics to game boards, copperware etc. We need a freelancer to revise the existing banner designs that are in various sizes.
Banners are classified as:
Large:
1920x450px
Medium:
640x420
640x250
Small:
310x200
Please give price for all dimensions seperately
I will ignore the quotes that do not have seperate quotes for all sizes