The new Disney Vacation Club 25th Anniversary Limited Edition MagicBands in all colors are now available for purchase on the Disney Store website. Previously these bands were on the Shop Disney Parks app but got pulled after they sold out of their allotment. Disney Store has these at a limit of 5 per color per person, which is a lot more than the usual 2 per person. You do not have to be a DVC member to order these, as far as I understand. These are limited to 2500 per color and do make special lights at entry touch points at Walt Disney World.

Here are the direct links for purchase on the Disney Store: