My subscribe-o-matic Haunted Zuzu group members received this tank top as a freebie gift yesterday evening. You might still be able to catch it if SL isn't acting up. Go to the Haunted Zuzu location and touch the subscribe-o-matic object and go to the history tab.
However, when I tried it, it did not give me an object.
BUT I will be doing more of these tanks and they will be free gifts to the group first, then maybe for sale later.