<p>He means dirt cheap as in, “Buy it from the dollar store or from a retailer (in bulk”). He means, “Cheaper than the expense of turning your roommate into an enemy with your constant whining and passive-aggressive nitpicking of irrelevent nonsense”. Stick around for a while, read some roommate horror stories, and count your lucky stars that your roommate hasn’t vomited on your bed or locked you out of your room to have sex. Yet.</p>