The Magic Your Way packages consist of room, dining plan, and park tickets. Disney does not discount its dining packages, or allow you to apply a discount code. The price is what it is, with one exception - there's a small discount available if you book through AAA.
If you want the dining plan, you need to book a MYW package through Disney or AAA. Depending on how you use the dining plan, you can save significant money over paying out of pocket, so Disney sees that as your discount. You will pay full price for the room.
If you don't want the dining plan, you can book a room-only reservation, and then buy your tickets anywhere you'd like. With a room-only reservation, the discount codes come into play. Check mousesavers.com for the current codes. You can also check places like Expedia and Travelocity for room-only reservations.
I recommend Maple Leaf Tickets, Orlando's oldest contracted discount ticket agent for Walt Disney World, Sea World, Universal Studios, Kennedy Space Center, Busch Gardens, Dinner Shows, Water Parks & other Florida Attractions.