For the Module alone; It ranges a bit.
For some reason some folks REALLY like it and bid up around $15-20 in a small bidding war; and sometimes it can go unsold at just $5 starting bid.
Even though alone the Dragon magazine might only get $2, together as a lot, and with the listings wording being just right, they could enjoy a small boost.
In your shoes, (If they are both in Very Fine to
NM condition) I would start it at $9.99 in a 7 or 10 day listing with reasonable shipping costs and hope for a bidding war.