http://proxy-list.org has some pretty good ones. They have a VIP section where you can buy a month password for $10. The proxies that I've gotten have been great and pass my tests when I put them through a strict checker.

Also, they're refreshed wuite frequently and you can choose your settings for the precise types you want.

( I am in no way affiliated with http://proxy-list.org. I just use their proxies and I think theyre pretty good)

Hope this helps!