Here are links to two stores that we are aware of that sell heirloom fabrics:
Chadwick's Heirlooms - (804) 285-3355 / Richmond, VA
Peanut Butter and Jelly Kids - (251)479-8811 / Mobile, AL
If you don't see what you are looking for, I would suggest doing a general web search for:
"+heirloom fabrics" +(Insert word, such as batiste) include the plus signs and quotes when searching.
or search "Heirloom sewing supplies" (with the quotes) and many stores will come up in your search.