Quartz balls are quite expensive. I've seen quartz balls that were 2" cost 40-60 dollars.
I agree with using a mirror to start out with, but not just "any mirror." There's too many things reflected into it, and will distract you.
Make a "black mirror." Simply buy a picture frame and paint the backing black. Let it dry, and you can cleanse and charge it in the moonlight. These are also said to not be touched by the sunlight, for they'll loose such energy. When using this tool, simply light a candle, meditate, and with your "haze sight" (slightly blurring your vision) gaze into the surface. Record what symbols, faces, etc. that you see.
And remember, scrying takes practice. So don't get frustrated if/when it doesn't work the first couple times. Just be patient.