Looks like the deal is dead for all but a few colors of the 64GB model.
At MSRP, I'm hesitant to buy this vs. an iPad Air for only $100 more - not only are you getting the bigger screen, but you're also upgrading from an A-series chip to an M1. I really hope Apple pushes a quiet upgrade during their rumored October event and bump up the iPad Mini to an M1/M2, but knowing Apple's history with the iPad Mini's upgrade cycle I'm not optimistic.