I thought that I already had the Classics cards. Turns out that I have the Classic cards (which were part of a trivia game), but not the Classics cards. The "s" at the end makes a difference.
While I have the 2004 set, I was missing 2001, 2002, 2003, and 2005. The Trading Card Database gave me a nice team set listing for each year. From there it was on to Sportlots, Ebay, and the Beckett Marketplace. All of the cards from the sets were found and are now on their way. I'll show each year's cards once I've got them all.