Cheap replacement for the Pololu 23201a Serial Adapter

[TinkerTob]

Hi,

currently, the Pololu 23201a Serial Adapter would cost me about 15€, which would make this project more expensive than the old Spacemouse itself.

Is it possible to replace it with a cheaper alternative, like the Waveshare RS232 Board, or is there anything that specifically requires the 23201a?

Thank you!