Still no word on this, so I'm guessing it's not coming back, at least not in time for the sale.
It'd have been really nice if it was made clear that this was to be a limited run promotion. I don't usually think of DD services as having "stock" they run through or can sell out of, so I thought it would've been safe to sleep on it, especially given there was no indication on the sale page of this fact.
EDIT: I went back over the page, and yep, it does say "while stocks last." My fault I missed that, but judging by other people asking, it wasn't just me that was unclear. Definitely not a fan of the idea of "limited stock" in the DD space, though.