I tend to buy fabric lines from favorite designers or mfgs.
I just bought Kate Spain's Terrain and I just love it. Bought FQ and some yardage. I'm always checking on Craig's list for "quilting" fabric and supplies. Sometimes it works. A few months ago a lady was selling off her online quilt store inventory. Now that was a good one. Nice, well-known brands at $2-3 per yard. However, that was pure luck. Just have fun.