I've ordered from:
e-bay
fellow board members who were selling material
Favorite Fabrics
Hamels Fabrics
Quilters Corner
and Quilters Cupboard.
I've had very good experiences with them all! But by far the best fabric deals I've gotten was at Mardens in Calais Maine. Their fabric prices were 1/3 to 1/2 the price of the LQS in New Brunswick.