The premium muslins are nice. That's all I buy anymore (Legacy, Kona Premium, Southern Belle). They go nicely with the quilt shop quality and batik fabrics. It helps me stretch out my stash.
If you figure that the 108" is the equivalent of about 2.5 yds of regular width, it comes out to $4.80. Not too bad for a premium, but if you can get it on sale or with a coupon, even better! On their website, it's on sale for $8.99 (equivalent to $3.60 yd based on regular width).