AZ used to have them by the oil filters for free. I have not seen them for a while, but is was nice. Had the AZ logo on them. The ink faded on them, so they were not much use to me. The last time I saw some was at Pepboys this last Summer.
I'm thankful that I now have two trip odometers. One for tracking MPG's and the other for tracking the OCI status. Toyota rocks.