Sass course recommendation

Hi does anyone have a recommendation for a good Sass course?

I am hoping @Mosh will release a course on sass soon. He says on his html/css course he may release one in the future. I hope so because this is a really good course and sass would be a great addition and I would be first to signup

you can find good youtube videos about, check the traversymedia channel

Thanks im halfway through the crash course, its a very good course