If you fall in love with a less expensive line from a big box store, buy a small piece and wash it. It's amazing how much sizing some fabrics can have. If you have more left than a handful of threads, then buy what you need, wash it and starch it before cutting. Sewing it together and the quilting will stabilize it. Working will some fabrics will make your quilting harder. I have a borderline black in my current quilt. It isn't as easy to work with with the Moda fabrics in the same quilt, but it's not terrible and the color washed well. JoAnn's is tricky. The fabric wall is definitely a mix. The better fabrics are in the straight rows. Use what you can afford, but don't make it harder by using fabric with a low thread count.