I tend to find more 1969-S than any of the others between 1968-1974. 1968-S & 1973-S are just plain tough...I do not have numbers to support, but I would guess that the 68S and 73S are around 1 each per $50.00 bag. When I do find a 1968-S it is almost always a very nice coin (red w/ very little wear). I think a lot of the 68-S were saved being that it was the first S-mint cent to come out of San Fran since '55.