I found another Harmony 880 remote control with charging base. It's in excellent condition since it's always been used wrapped in Glad Wrap :-)  Can't find the charger that connects to the base  but I did find a USB to barrel tip cable that works fine.

No USB cable - you will have to find your own USB to mini-USB. But I did check it can connect to a PC and connect to Logitech's site for configuration.