EDIT: Aaaand they’re gone again. I’ll try to keep an eye out if this changes later, especially around the actual release day.
Pre-orders for boxes of the ninth Shinra Bansho Card card series are available again on AmiAmi.com right now, after having become unavailable just two days after first opening previously. The official release date is 4/16. I put in an order myself while they’re up once more – keep in mind there’s no telling when they’ll need to cut off orders again, so if you’re really interested, now may end up being the last chance for a while.