Well, one pound of fabric is usually about 3-3 1/2 yards. That would work out to about $5 a yard. There are several online stores that offer mystery bags or scrap bags so I think I would shop around a little. Of course, you would have to factor in shipping costs if you order online.
I love scrap bags because they force me out of my comfort zone and often add some colour and excitement to a scrappy quilt.