Saving money making coffee

As I continue my journey to save money on everyday goods, I started digging around and found some starbucks beans that were unopened. I decided to make 10 cups of coffee and chill in the fridge. That should provide about 5 days worth of morning iced coffee.

The beans I originally bought for about $7 and they can probably make about 60-70 cups of coffee. Considering I had been paying $2.25 for a coffee from Dunkin Donuts, that's about $78.75 I wouldn't be spending, netting $71.75 in savings. However, the coffee machine and grinding equipment cost about $150.

So within two bags of coffee, I will have at the very least paid for all the equipment and beans and well on my way to savings.

Anyone else doing these little things to save money?