Computer temp checker with display

Hello I was hoping to make a my first real arduino project be a temperature monitor for my computer. I wanted it to have 4 probes(one gpu, one cpu, one case temp, and one outside temp) Then it would display it on a monochrome lcd screen with a switch to switch between celsius and fahrenheit.

I already have a arduino uno i can use for it so would it be plausible to do it for under 40$ (not including the cost of the arduino)?

if so, I have a few questions:

  • What parts would I need?
  • Where would I have to place the probes to get an accurate measurement without drilling into the devices?
  • What is the skill level you would rate this at?
  • How long would a beginner take to finish a project like this

You could do this cheaply and painlessly using DS18B20 sensors and a 16x2 LCD display.