Some time back, I went to Hancocks_paduccah.com and got their batting samples, which were very helpful to me.
If you are concerned about shrinkage, you might like to use a poly product. I prewash all my fabrics and am not particularly fond on the rumpled look of traditional quilts. I love Hobbs Thermore, as it is very easy to baste, and is extra warm. Sometimes I appreciate the 10" spread on quilting with it. I buy it by the case because I do lots of quilts.