No - you will not find Superior thread in Joann's or any other place except quilt shops. The same goes for Aurifil. These threads are the best quality and therefore cost more. Quilter's are a bit picky about the thread they use because a lesser quality thread leaves lots of lint in your machine. I used to use C&C years ago but will not do now. It's like fabrics - get the nest quality of fabrics, threads, etc. thst you can afford as your time is also worth using quality products.
I purchased some Aurifil thread and matching bobbins in a shop in upstate NY - The Yardstick in Cobleskill. NY - and they are both 50wt. Great stuff.
Sandy in Mooresville, NC