€ 54 | espresso calibrated coffee tamper with steady pressure anti pressure deviation design Adjustable depth design 58.35mmhttps://s.click.aliexpress.com/e/bY3nNMWy
€ 54 | 304 Stainless Steel Coffee Tamper 58MM Maracoon Coffee Distributor Coffee Powder Hammer Customized Coffee Accessorieshttps://s.click.aliexpress.com/e/bTjMSKI8
These are the cheapest I could find.
I was doubting between 58.35mm and 58.5mm push type tamper, ended up buying 58.5mm wedge type levelling tool and 58.5mm push tamper. I would probably buy the tamper if they had 58.5 58.55 or 58.6mm.