Most are around 40$, but from experience the Dakis that are pillows themselves are not the best quality around and can be a bit itchy with skin contact.
What you want are Daki Pillow Cases. They are usually made out of a more comfortable material and much easier to wash.
Alas, such pillow cases are quite rare compared to the pillow ones, and tend to cost more from what I have seen.
Most are going to be Females. Last year I was surprised to see some male characters, but they are still not very common and have little variety.