Also, check out the Stoney Creek website. They have cuts from several overdyes fabric dyers. I believe ABC Stitch does too. I buy a lot of fat 1/8 yd cuts from Picture This Plus. There is a British dyer that does a lot of marbled dyes. I'll have to look up the name & edit this reply. Check back, please!
It's Polstitches. ABC Stitch Therapy carries it. 2-3 weeks delivery.