Come on Bambu, get us some H2 series 3d build plates!
Until then: You can get those 3D effect sheets from other sellers as well. They’re just sheets of film that you put on the print plate. If there isn’t a size that fits, get a big 3D effect sheet and cut it to size.
I don’t have any experience with this retailer, but they offer all sizes, for example: kaizen3dprints. If you look for it, you’re sure to find even more.