There is a massive selection of products available. I don't have one particular favourite manufacturer as they are all so different.
Another massive market is kits. There are hundreds of them out there. My favourite is The Scraproom because they don't overload you with lots of matching papers you will never use. Their kit contains 4 page kits which are all completely different so you feel you are getting a varied choice. I recently discovered Bad Girls kits and am going to give them a try.
I did something on my last layout that I haven't done before and used a cloth swatch. This one is a Cath Kidston one and the best thing was that it was a freebie. If you go to the website you can choose up to 5 (I think) swatches free. You need to click on the fabric you are interested in and if they offer a swatch of it then there will be a link there to order it.