As low as $10 if you all components are from JLCPCB's basic component library. For this board, more since there are some through-hole components and neither MCP

As low as $10 if you all components are from JLCPCB's basic component library. For this board, more since there are some through-hole components and neither MCP4141 nor ESP32 (nor the buck modules used) are in the basic library.