Based on this product's specifications, here are some alternatives and similar models
PEI Spring Steel Build Plate for AnyCubic Kobra S1 / S1 Combo (MPN S010261)
Summary description:
Replaceable PEI spring steel build plate designed for the AnyCubic Kobra S1 and S1 Combo (MPN S010261). Provides a PEI-coated magnetic surface for improved part adhesion during printing and easy part removal after cooling. Suitable for consistent FDM 3D printing workflows, quick bed changes, and maintaining a flat, reusable print surface.