Walmart has an exclusive on the Universal 100th Anniversay slip editions which include a Universal 100th Anniversary Collector Card. There are 25 cards in the set and they are randomly inserted. The cards are 5" x 6 3/8" (almost as big as the case) on thick card stock. These cards are shrinkwrapped on the back of the case (inside the slipcover); sometimes it is a second shrinkwrap over the existing shrinkwrap. All you need to do is slip the case out a bit to see which card is on the back, so it isn't a blind buy!
The checklist so far...
01. American Pie (1999)*
02. Apollo 13 (1995)*
03. Babe (1995)
04. Back to the Future (1985)
05. Big Lebowski, The (1999)
06. Birds, The (1963)
07. Breakfast Club, The (1985)*
08. Bride of Frankenstein, The (1935)
09. Despicable Me (2010)*
10. Dracula (1931)
11. E. T.: The Extra-Terrestrial (1982)*
12. Fast and The Furious, The (2001)*
13. Field of Dreams (1989)*
14. Frankenstein (1931)
15. Jaws (1975)
16. Jurassic Park (1993)*
17. Mamma Mia! The Movie (2008)*
18. National Lampoon's Animal House (1978)*
19. Spartacus (1960)*
20. Sting, The (1973)*
21. To Kill A Mockingbird (1962)*
22. Wolf Man, The (1941)
* - Need scans still (cards are not numbered)
Also, based on what I found so far, I am almost certain one of the cards will be The Mummy (1932).
EDIT: I hit three near-by Wal-marts and so far, I only found the cards on 7 Blu-ray titles and 1 DVD title. I think these may just now be hitting stores, so hopefully more titles will turn up with them. Also, there was just 2 or 3 copies of each title that had a card, even if there was 10 or 12 total copies of that title, so these may be very limited.
The titles I found cards on...
Breakfast Club
Blues Brothers
Inglourious Basterds
Waterworld
Bourne Supremacy, The
Bourne Identity, The
To Kill A Mockingbird
Despicable Me (DVD)