OP - you are aproaching this the wrong way. You would 'hope' to get a PIN or discount and then by the time you get one, you'll over pay for flights (if you drive then this doesn't apply).
You should budget for a disney vacation without PINs or CODEs. If
DDP is too much, then budget your meals. Same goes for the type of resort. If a deluxe is too much, then go for a mod, or a value.
Decide on the dates, look at travel options (flights, diriving, etc) and make your reservations.
Then if a PIN or public code comes out, call in right away and apply it to your res. You will either SAVE money, or you can use it towards upgrading your vacation (ie if you reserved a mod, now go for a deluxe - if you get FD, then apply your meal budget towards a better view or souvenirgs)