The new-in-box Lucent/Agilent REF-0/REF-1 units that were selling on ebay last year. I have been running this GPSDO ever since I bought it. Includes a Meanwell 24 VDC power supply. I will also include a spare REF-0 unit. $200 OBO plus shipping/insurance. More info: http://www.prc68.com/I/KS-24361.html Joe Gray W5JG