I don’t use my emonPi enough, someone may get better use. It has been working fine in my dusty cellar since 2017 but I just don’t look at the data enough now I have a smart meter. The following cost me £230 in January 2017.
(Enclosure & LCD: Fully Assembled, Raspberry Pi: Raspberry Pi 3 & 8GB Pre-built SD card, Optical Pulse Sensor: Optical Utility Meter LED Pulse Sensor , Temperature Sensor: 1 x RJ45 Encapsulated DS18B20, Power Supply 5V DC USB + Cable: UK Plug )
3 RJ45 Encapsulated DS18B20 temperature sensors
1 RJ45 Expander for DS18B20 & Pulse Sensors
I would send it on without the SDCard (instructions here for how to set up your own Raspian Stretch based emonPi: https://github.com/emoncms/emoncms/blob/master/docs/RaspberryPi/readme.md), but other than that I would be delighted to pass it on to an enthusiast for a fair price.
Yours for £99!