Anyone have any recommendations on where to get 120-150mm diameter heated bed?

Anyone have any recommendations on where to get 120-150mm diameter heated bed? Preferably one that has a thick aluminum backing to it.

i think they sell custom sizes: https://clever3d.de/epages/7a4290fc-7c7f-46cc-9b99-eadef22228e2.sf/de_DE/?ObjectPath=/Shops/7a4290fc-7c7f-46cc-9b99-eadef22228e2/Categories/Druckplatten

I know that AliBrother on AliExpress used to make custom sized silicone heaters. I bet they would make you one. Can always get a pcb heater drawn up as well.