Coastals I am not sure probably 100 or a little more for a really good one. Irian Jayas are going to run you between 100-150 for anything worth looking at. The size difference between those is huge with coastal being much bigger 7-10 feet average. Irian Jayas would probably be a good place to start as they stay relatively small, have good temperments, and arent very expensive (neither are coastals) I can tell you if you want a good Irian Jaya, Yasser from spitfire reptiles produces some of the, if not THE best I have seen. He has some posted right now in the classified and though they might be a little more than some you find cheap at shows you will definetly get what you payed for when buying any type of Carpet. hope I could help.
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"Victory is reserved for those willing to pay its price"