Contact motels or hotels in your area for their sheets. I did and received two big bags of sheets.some just had little tears along the edge, they throw them out and we can use them for batting and also for foundation pieces for our scrappy quilts.
Heard an ad on the radio that someone had sewing supplied and called and asked about fabric. She had lots so I went to look. Got 15 pieces for $14.00. one piecewas 7 yards long and other pieces smaller than that. So got a bargain.