I would suggest that you go to a quilt store, where you are pretty sure they will have good quality fabric, and just look and feel the fabric, try not to get involved in the print, just the weave, weight and feel. Then go to Joanns or walmart and do the same, it will become more obvious to you. That is not to say that all the fabric at either of the stores will be all good quality or all bad, but it will probably expose you to both that way. Depending on what the use of the quilt will be, you may choose to use the good stuff (for a quilt that you put hours and hours into that you want your great-grands to enjoy), or for a baby quilt, or picnic quilt that won't survive more than a decade, you may choose the lesser quality fabric. I would add that sometimes the cheaper stuff is very hard to work with, it may stretch, it may ravel, bleed etc.. so it can make the process stressful for you.