BannerAd.org http://www.bannerad.org
National Organization of Banner Ad Designers has a list of banner ad designers and tips on purchasing banner ads.
banneramalink.com http://banneramalink.com/
Specialists in designing animated and static online banners for advertising and marketing on the web. Pricing, samples, and contact information.
BannerBuild http://www.bannerbuild.com/
Company offers to render professional banner design services for companies, organization or personal web site. Develop both animated and static banners.
Flash