Make your own pillowcases.
Get some material you like and measure your pillow. Make sure you have enough material to cover the top. Sew around all 3 sides and leave one end open. Hem that end. Insert pillow.
Get some material you like and measure your pillow. Make sure you have enough material to cover this twice. Sew around all 3 sides and leave one end open. Hem that end. Insert pillow.