Yes, I agree that sheets are the cheapest but you are limited on colors and prints or designs. I recently purchased four king-size, flat sheets on clearance at Target for $6.98 each. I plan to make curtains from them. The WalMart stores in my area always have a big pile of fabric bolts. One pile is $1.00 a yard and the other is $2.00 a yard. Large fabric tablecloths on clearance at Big Lots also gave me material for curtains in several rooms. They were about 70 inches by 102 inches and cost me $4.00 each.