Development 3 test banners

I am looking for a web design agency to start delivering banners on a sctructural basis (10-20 banners a month). As a start I would like to receive a set of 3 test banners in the most popular formats (rectangle, sky scraper and 234X60). I attached a briefing document and some images. For this set I am willing to pay USD 100,00 and for the forthcoming development a flat fee per banner depending on negotiations.