This one sells 1/4 yds
http://www.twobeesfabric.com/shop/18...-Shirtings.htm
This one has a reproductions department:
http://www.fabricattic.com/store/pc/...?idCategory=83
Seller franks11 on ebay seems to have $1 each FQs of Civil War fabrics (although some look pretty modern to me)
And this one sells by the 1/2 yard:
http://www.reproductionfabrics.com/shelf.php?ID=39