Lately I've been buying a roll of each -- the 45X40yds I use for small items because 2 of those rolls equal one big one and buying two is cheaper than buying one large one. Then I buy the big roll for full size, queen size, and king size quilts. A roll of each lasts me quite awhile. And buying online from JoAnn's is generally much cheaper in the W&N. Happy Quilting!