As for buying GOTS quilting fabrics...Here's a list of a few fabric houses that produce GOTS certified fabrics:
Robert Kaufman
Birch Fabrics
Moda Fabrics
Monaluna
Cloud 9 Fabrics
Timeless Treasures
Clothworks
A lot of these names we already know, like Moda and Robert Kaufman. I believe that RJR also does a GOTS line, but I'm not sure. I'm sure there are more lines out there. Feel free to add to the list.
One of my favorite stores for buying these fabrics is http:''www.Honeybegood.com . Great service, absolutely beautiful, high quality fabrics, always something on sale, (I'm cheap,) and the have some great prints for children's quilts. They also offer a tiered discount.
~ C.