this is the one I use, the price depends what size you get. I love it and sleep good with it! I especially love it keeps my head cool in the summer. I do notice a big difference in how smooth my hair looks versus when I sleep on a normal cotton pillowcase. My silk pillowcase ripped (because I wasn’t hand washing it) so while I was waiting for a new one to arrive I had to use a cotton one and they are so lame now that I’ve slept on silk lol. They are a bit pricey but if you take care of it it will last long. Even my last one that ripped I had for like 6 months or more, I was just lazy and washed and dried it with my clothes every other day and that was too harsh on such a gentle fabric. It won’t keep hair from knotting, but it helps reduce breakage.

Also side note: I turned my old ripped silk case into some face masks because I have a sewing machine and have to wear them at work and all the other masks were irritating my skin! My husband gave me the idea luckily before I just threw it out!