Click the link in my post, then scroll down a bit, and on the right hand side should be an orange graphic that says, "GET TICKETS." When you click that, they'll ask you for your email address, and to choose which charity you want to support. Then click again, and you'll be taken to the Broadway Offers site.
If you're willing to pay that much for mezz, see if you can get partial view day of. They sell the middle 3 seats of the first row for partial view because in a couple of scenes, the conductor rises up for a minute or so, but other than that your view is perfect. Definitely worth it if you are willing to pony up $60.