I buy backing fabric when it's on clearance. I buy at least 7 yards. jWhen Connecting Threads has fabric marked down to less the $3 a yard and that's what I buy for backings. I don't try and matchy matchy my backing to the front but get a good co ordinating color or print. Backing is one of the biggest expenses of the quilt and I don't like to spend big $ for it but want quality stuff.