Good news, though. I went down to the Toys R Us just off Florin Road and they had the Exclusive Treehouse of Horrors II Playset. They weren't even putting them on the shelves. I had to ask the lady at the customer service counter if I could please have one. Then I asked for another one, so I could keep one in archival MIB condition, and open the other.
Kang and Kodos are the coolest.