are there any cheap and readily available adapters that can allow me to hookup a 12V DC CPU fan via molex connector? Everything I found online is for car batteries and I'm a little bit weary about cutting up phone adapters.
How handy are you on wiring? The simplest way is to dig through boxes of old power bricks until you find one that outputs between 9 and 12V. You'll want around .25A which most bricks should handle... then cut the wires (as a reminder, don't do this while it's plugged in), figure which one is positive, cut off an old molex connector from an extension or something and splice them together.