In case you haven't seen any (or many) ivory chips, my collection of 804 chips (no concentrics) are displayed on my site. The chips on my site are some of the finest conditioned chips (few cracks or holes with good carving and coloring). Follow one of the 2 links (there are links to all sorts of ivory pages inluding the other 14 pages and Ivory Matched Sets):
For larger screens set at a resolution of 1650x1050 or larger (the BEST option): http://www.oldpokerchips.com/IVORY/IDcreatures.htm
For all smaller screens: http://www.oldpokerchips.com/IVORY/IDcreatures1.htm
Maybe I can recruit some converts.