Showcasecages.com make very nice show cages. There is also repti-racks.com that can custom build pretty much anything for you with unbeatable prices.

About the "too big" factor. With almost every species I highly disagree with this notion of a cage being too large. A cage may be too baren, too clustered, too small, but in my opinion a cage cannot be too big as long as the cage is properly filled with necessary factors.