I got mines on Amazon here for ~$70 USD. It's almost $100 rn tho. It's really high quality imo. Always fluffy and soft. I don't remember what kind of cotton it's filled with but I did research on it before and bought the best one I could afford.
I was inspired to buy one since my friend had one and I bought one just to joke around, but I love it. My friend's pillow is pretty flimsy but the one I have has a good firmness to it. I don't regret it at all
Amazon for ~$70.
Had I known most authentic Japanese dakimakura were 160x50cm, I would've gotten that instead ;(
But Korosan fit fine so I'm happy