Found two retail sources for (reasonably priced) organic upholstery-weight fabric:
www.moonbathshop.com (see: Organic Fabric)
NOTE: "Green" fabric is not necessarily "organic" - it just means the fabric isn't chemically treated (ex. Homespun is "green" but is not organically grown).
There's more out there - Karen have you found anything yet at the wholesale distributer level? I'm assuming the majority of organic fabrics are imported, hence the need for domestic distributers.
I really need to get a life...