I have always been happy with my fabric purchases from e-bay. I have a few specific Sellars I do business with and for the others, I read everything on their listing, if they do not have enough pics or information on the item in question, I do not buy from them. I also go by their score and if they have below a certain % for teh amount of items they have sold, I do not buy. Customer Service is important to me even on Net so I am choosy. Occasionally you will get a knucklehead as I did when I purchased a Singer 99K that arrived damaged. Then, you just stick up for your self and do what you need to get the return and refund albeit in a nice way.
If you want the names of who I like, PM me and I will get it to you.