I got some sample chips at the Convention still in the plastic pages that the salesmen use (at least those who speak British). The first three digits in the description represent the size in millimeters. I don't think I have any duplicates of these, but will post them for sale or trade if I do.

The plastic pages are kind of interesting. The have 15 pockets, each with a place for an i.d. insert, and have flaps over the open edge of each to keep the chips from falling out. The also have 13 binder holes to fit just about any kind of ring binder. I wonder who makes them?