I also wanted to point out that when you go here:
http://www.mastersofdesign.com/multicatalog.asp?CAT=1
you can click on Alpha Phi and Gamma Phi Beta (for example) and yes, you will see the badges.
But if you click on Sigma Sigma Sigma or Phi Mu (and others...Pi Beta Phi, too), it takes you to the sorority's webpage. I suspect that this to show people that "Yes, we the people of Masters of Design make the badge" but to quote dzandiloo, I too "speculate that this is done to keep non-members from purchasing them".