Here's what you can do (And please somebody correct me if I'm wrong and they have changed this), but what I understood could be done was.....Buy a 5 day parkhopper discounted park ticket from
Undercover tourist. With the mousesaver.com discount you will save $29 off the gate price on that ticket.
Now take that ticket....and enter the park with it. Once you have entered the park, it will bring the value of that discounted ticket up to the full gate value (not $29 less). Than you can go to Guest relations and UPGRADE your 5 day parkhopper to an AP. You will get the
DVC AP price and you pay the difference of the gate value 5 day parkhopper to the AP price. This way you have saved $29 for EACH one you buy. If buying 4, that's $116 savings.
Again, I know you USED to be able to do this....but I'm not sure if they changed this with the upgraded Magic band entry system.