Amazon has a Chinese vendor selling small zin flower pots. Approx. 5" height. They are coated with a plastic to protect the surface. Very inexpensive.
I cut a section of one ( about 0.75mm thick) for use as an electrode in Cu/Zi. and Ni/Zi cells.
I easily removed the organic coating with ethyl acetate and rubbed the surface with a piece of foamed copper. A dip in 5& aq. HCl solution can clean the surface before use.
This zinc sample was also givne a 6 ton press to flatten the surface.