Retayne. Many quilt stores carry it (call first), and it's widely available online at Amazon, Dharma Trading, ProChem, etc.
There are two types of bleeding. One is from excess dye in the fabric. Fabric can absorb only so much dye and, if the manufacturer has not rinsed sufficiently, the excess will bleed out in the first washing.
When fabric doesn't stop bleeding, it means that the dye was not set properly. Retayne takes care of that (for most dyes, anyway) and sets any unset dye. Still, with a bleeder fabric like this, I would check after using Retayne and make sure that all the bleeding has stopped.