I was at a local civil war show today and saw these ivory and MOP chips. They looked expensive to me but then I know almost nothing about those types of chips. Are any of these a screaming buy? The MOP chips looked suspicious to me because they were all different shapes but had the same type of scribing on them. There seemed to be no rhyme or reason for the numbering. Why have a 5 chip that is 4 times larger than the 100 chip? The MOP chips were $20 each. If any of these are a very good deal I could go back and pick them up.