It's easy to make your own pillow cases. I take a yard of 45 inch wide fabric and zigzag or overcast the edges, then fold in half and seam the bottom and one side. Press the seam open. Next turn down a wide hem, stitch and press with an iron and your done. You can make them out of any cotton or cotton blend fabric you like, but for myself I like 100% cotton, the type found in the quilting section of fabric stores. Prewash your fabric first in hot water so it doesn't shrink afterwards. If you need a longer case, use 1 1/2 yards or however long you need. Look for sale fabric; or if you have some older sheets that still have good sections, use those.
For those who have don't have a zigzag sewing machine turn down 1/8 - 1/4 inch on the edges and stitch before sewing the seam. This will help to avoid raveling of the edges.
Don't have a sewing machine? Look in a sewing book or on-line for hand-sewing lessons. There is peacefulness in sewing by hand and making your own linens.
It feels good when you can bypass the expensive prices of ready-made linens. You can decorate your own cases with whatever trim your want, or embroider them. You can even get really fancy and sew a satiny ribbon piping along the hem.
Enjoy! Edey