Gosh, that is really cheap. Is it by a well known quilting manufacturer or just no-name? I think that I would want to see it and feel it before buying it for backing. Maybe buy a yard and see what it's like? If it's too thin, the batting could beard through it, and who needs that mess?
I love Thousands of Bolts for long yardage. Most of their fabric is less than $5 a yard and they also stock wide backing fabrics. I've had great fabric and great service from them.
www.thousandsofbolts.com
No affiliation, just a satisfied customer.