I've heard of Maple Leaf and mousesavers has a link in their newsletter to Ticketmania and a second broker but I don't remember the name.
I just got my tickets yesterday from ticketmania with a bunch of coupon magazines. They even make a copy of the back of your tickets for you. They offer free shipping and were cheaper than buying from Disney.
FYI-They have the 8 and 9 day tickets and at the time I made my purchase the 8 day tickets were cheaper than the 7 day tickets.