Sofa slipcovers are priced according to the fabric, color, and pattern. The cheapest ones may be bought for $30. The price can go up to about $100, or more. The cheaper sofa slipcovers are typically simple and loose. Those that have elastic bottoms, or fitted with ties, or sewn to look fit cost a little more. The costliest ones are those that are specifically made to fit the sofa. These covers are meant to follow the contour of the furniture with the least creases and the least hassle of tucking the cover over and over.