Many chip vendors will give you a PID under their VID if you're making a product. For example this blog post uses and ST chip, and they'll provide a PID if you request it [1] - free of charge, but subject to some conditions.

(Of course if your USB device needs Windows drivers, you'll still have to deal with things like code signing...)

[1] https://community.st.com/t5/stm32-mcus-embedded-software/dea...