I have made many of my own banners anywhere from the standard 468×60, 120×120, 120×600 skyscrapers for my website. If you are looking for a particular casino/poker room in the banner, we would need to ask their permission first to use their logo. I can do static banners or animated gif banners (like most of the ones you see everywhere) I have not done any in Flash as of yet, but will be trying some out int he future.
As far as pricing is concerned:
a static banner: $20
an animated gif banner: $25
PM me with your ideas or questions, I can usually turn them out in about 1-2 days tops.
SAMPLES from my site.
Jeff