There are codes for 'Room Only' discounts...that one I believe is BUC. Then there are two Magic Your Way codes...one is without dining and it's ZHD and one is with dining and it's ZHE.
I don't know if there is a place to put these in online, I called (407) W Disney and talked to a live person and gave them the codes. It saved me $64.00 over what I had booked. The discount code on the dining didn't actually make the dining any cheaper, it's just a code you use in the MYW package if you are including dining. Or it didn't make my dining any cheaper, just made my room and tickets $64.00 cheaper. One more note on the dining...we've never done the dining before, but from everything I've read you're suppose to save about 40% off versus if you purchased those meals without the dining plan.
The Disney Chase Visa does not have any offers as of yesterday when I checked.
Hope that helps you out.