Dude, buy a low-end espresso machine. It's the most efficient way to extract caffeine and therefore the most cost-effective way to make coffee. It also gives you a much higher taste/smell ratio of the coffee.
I bought one for $80.
I like to begin the day with 4 shots of espresso, which would set me back $18.20 per week ($2.60 each) at Starbucks.
But for $7, I get 1/2 lb. of beans, and then pay another $1 for distilled water (minerals in tap water will ruin your espresso pump within weeks).
That comes out to about $8 per week, or about $0.29 per shot of espresso. The machine has paid for itself multiple times over.