I know the team is constantly updating the learning materials, especially with PMBOK 7, but if you have already been through the PM PrepCast course, then I think the PDU packages would be a better choice than to buy the current version of the PM PrepCast for PDU reasons. Otherwise it might feel a bit repetitive, especially as it wasn't that long ago that you already did the course. Here's the PDU info:
www.pducast.com/
There are a number of options there to choose from to learn something new.