where to buy organic cotton/wool fabric and yarn online...

[Lillypop]

I need to buy organic cotton fabric (for making diapers) and organic wool yarn (for knitting soaker covers). I'll need to buy snaps for the diapers but I'm sure I can get metal ones at Walmart or a craft store nearby (or online in bulk cheaply). Also, organic sewing thread? Any website offer all of this stuff, or what sites are best for good quality at great prices? I'm on a budget, but still want organic materials. Thanks!