Buffalo arms sometimes has the brass. Currently out of stock, but get on their waiting list.
https://www.buffaloarms.com/35-winchester-cases-35win
RCC Brass also makes it, but it is pricey at $3.91 a case.
https://www.rccbrass.com/product/35-winchester-self-loading/
https://www.buffaloarms.com/35-winchester-cases-35win
RCC Brass also makes it, but it is pricey at $3.91 a case.
https://www.rccbrass.com/product/35-winchester-self-loading/