I wish I could remember if your wedding is a Custom? I'm thinking it is, but I'm not positive. If so, do you know if part of the Save the Date packet included ticket information? I remember the prices on these were much more competitive than regular rates, you got the "convention rate". That may have changed, I'm not sure. You might check with your EM, they may be able to guide you.
Did he maybe buy a package that has the Magic Your Way ticket option?