$75 - IN-14 / $125 IN-18
Bob C. sent me a cool single tube Nixie clock that he found. This one is made by Ohararp LLC and it sports either an IN-14 or IN-18 Nixie tube. This clock is USB powered and specifically designed to sit on top of your computer (sorry, iMac users!) The frequency source is a 32Khz quartz crystal and the time is kept with a .22F capacitor. This is a cool design.