I follow a lot of blogs of the 'modern quilters' and have discovered their fabric sources that way. You might want to look at
http://filminthefridge.com/ - she has some low vol prints on her blog post right now and she also mentions several of her fabric sources. Another good one is
http://sewkatiedid.wordpress.com/ I have gradually, over the past year, continued to add to my list of quilters that I follow - sometimes just by looking at their lists of their favorite quilters. When you start reading these blogs you start to see the fabric lines and where they are getting them. Good luck, and have fun!