amma gave you some great links. I used some once called Celestial Spirit #6020, made by Springs Industries Inc. I found it on eBay, which is great for finding specific design fabric as the desciption of what is on the fabric is in the item title. For instance you may be looking for teddy bear fabric, which may not come up when you search on google or a shop's website, because it's product name might be something like 'childhood dreams' or something daft like that. But search in eBay for 'teddy bear fabric' and you will get LOADS!
Happy hunting! :D