I buy full bolts of muslin, stabilizer and fusible fleece. BUT, there are no guarantees your bolt will be perfect throughout. That's the good thing about having the fabric cut, you can view both sides before cutting to be sure you're not getting any flaws that will affect your project.
If you ever get a bad bolt of anything, notify the manufacturer. I bought 3 bolts of fusible fleece made by Pellon, it's a little pricey but high quality and JoAnns sells it so I can use a coupon.
Well, I'm unfolding a bolt and get about 1/3 of the way through it and it's cut!! Not good if it's a quilting project, fortunately it wasn't so it didn't really cause me a problem. Got another couple yards into it and suddenly it's burnt - I mean like it caught fire on the roller or something, black soot, big burn holes, crinkly ashy stuff goin' on everywhere.
I took pictures, emailed Pellon (couldn't send the pictures on their customer service email but told them I had them if they wanted to see them), they replied quickly and sent me a HUGE bolt of the stuff for free.
So never think you're stuck, if the manufacturer is a quality one, they will make good on their product.