My local fabric store doesn't have a large selection of knit fabrics. I found some that I really liked at fabric.com and I used this pattern to make a pair of leggings. It doesn't get any easier. I made these in less time than it would have taken me to go to the store, pick out a pair, and get back home.
Now, I always have my eyes open for cute knit prints. Please share if you know of any other great fabric sources.