Are you looking for discounts on something in particular? For example, accommodation, theme park tickets etc?
I have always found discount coupons in various places in Orlando - there are free magazines which I have got from shops, diners etc which often have money off offers.
Some of the food buffets are very reasonable even without a discount
A Good Start for all sorts of discounts and savings would be mousesavers web site. You will also find lots of vouchers in free discount books at lots of locations in Orlando including the tourist information centres. The Orlando Magicard is probably the most widely accepted discount card which you can print from the web site listed below
Orlando Info Website and go to Magicard section unfortuntely I'm not allowed to post a direct link.
Hope this helps but there are loads of coupons and discounts as the Americans love them!