Open a proxy scanner and start scanning, you'll have alll you need in a few hours probably. Lol. Nah but depending on how many you need, I'm only half-joking. There are a LOT of open/public proxies from China. There's so many that most people filter them out and don't include them in their lists because more often than not, they're useless. If you don't need a ton of them then in all honestly you could probably scan what you needed yourself.