Cheap BitCoin mining setup?

My "mining rig" is my gaming computer with a GTX 960. It would earn around $1 a day if I ran it 0-24, I sometimes start the miner up to earn some cents while I know I'll be away but I won't turn off the computer just yet. Electricity costs less, so it is still worth it, even if it is just a few pennies each day, it adds up over time.