Are you needing website graphic banners to represent your business or web site online?
Wild-WestWebs.com offers custom graphics in the size you need.
Other web sites offering banner advertising and graphic sizes for those sites include:
TeamRoper.com ( 3 choices):
462 x 89 px top banner, 440 x 330 home page billboard, 178 x 200 side banner
The cost for custom designed for banners this size are: $40.00, $55.00, and $35.00.
If you'd like to purchase an ad for teamroper.com, you can do so now:
eBarrelracing.com
sample of 400x100: 
190x188 px square, 400x100 px and other assorted sizes.