Bill, if you selected "Yes, Please" to the USB-Serial adapter option when you bought the full kit, it will come with one; that's what I'm using, and it works perfectly.,? That said, it looks pretty generic - it's just one of the board-level devices with a mini-USB socket on one end and a six-pin connector on the other, so any of the Arduino-type devices ought to work OK, too.? The ones you found on Amazon look identical to the one that came with the kit.
You only need one for the console to run CP/M effectively.? I've been considering building a TTL-RS-232 level shifter for the second port, and using it as a printer port (it's currently configured that way in the CP/M BIOS).
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Mark Moulding
