I don't know how many SCF members keep up with the changes in the types of labels produced by APC machines (now called Self Service Ship and Mail Centers) but I did find the lead article at this link rather interesting on the subject.
It seems that as of April 12, 2012, the US Postal Service started a pilot program whereby these labels would be designated "Forever" in terms of denomination at the current first class rate of 45c each and you can apparently select one of several designs to appear on them, including Mr. ZIP!
Although this is not my collecting specialty, I thought I'd post the link for anyone so interested:
http://mid-citiesstampclub.webs.com...02012-05.pdf