Anyone using buckwheat pillow? how much did u pay for the buckwheat pillow? Any review? Where to buy it?

I received a lavender buckwheat pillow from Japan as a gift and I didn't have interest in it so I never really used it and chucked it aside. Last summer, I found it when I was home and it had gone mouldy! I could literally see greenish-brown stains seeping through the pillow case. To be fair, I didn't care for the pillow properly and that's why it got to that state but knowing what I know now, I wouldn't get it for anyone as a gift, let alone a baby :(