I found “Ceramic heating plate, high temperature, 30x30x1.3mm3.7-48v22 infrared round electric heater” on Aliexpress pretty quickly after doing a Google search for “ceramic heater plate”.

Looking for the best Hot Plate For Cannings? ... 🎄【Compact and flexibility】The size of our single burner electric ceramic cooktop 2000W is 11.41*17.71*3.15 inches with a plug, ...

[mightyohm] put together a nice piece of lab kit. It’s a PID controlled hot plate. The plate is capable of reaching 500F, hot enough to do SMD reflow soldering. The large chunk of metal has a… ...