Check out these sites and watch their videos.

I got my 7 bag kit from KabulBaba.com my self

http://www.kabulbaba.com/

http://www.bubblebag.com/

http://www.resinextractor.com/product1.htm

Tumbler systems

http://okief.com/

The 5 gallon kits all use about 200 grams of trim. Sorry I can't remember how much I got from the last few batches. It's not much but it's very good and suprising how little it takes to get stoned.

Enjoy