stm32g0 parts (for example the stm32g030) can often be in the <$1 range, or <$0.50 at decent quantities. I think there is even an stm32c0 line planned at a lowe

stm32g0 parts (for example the stm32g030) can often be in the <$1 range, or <$0.50 at decent quantities. I think there is even an stm32c0 line planned at a lower price point. There are likely lower cost parts, but the REALLY cheap 32 bit parts are moving to RISC-V, see WCH's recent releases. Edit: as a specific example, the STM32G030F6P6TR is available at $0.74 for one, or $0.45/ea at qty 1000 over on JLCPCB's part list: https://jlcpcb.com/partdetail/Stmicroelectronics-STM32G030F6P6TR/C529330 https://jlcpcb.com/partdetail/Stmicroelectronics-STM32G030F6... I put some of these on a very recent project.