Where to find a guinea pig bedding (not wood shaving)?

I've gone to any shop that sells fabric and gotten some end remnants. That's usually the bits that are left over after the rest of the bolt of fabric is gone; they sell them fairly inexpensively because they're odd sizes. Here in the US I've found them at Kmart or Walmart. The only problem is that some guinea pigs like to chew on the fabric, and if they swallow it, that could be a problem. Just keep an eye on them, and if it looks like they're eating it, you might want to try something different.