I have heard bad things about SciFit in regards to quality. And, for the record, that's still too expensive.
For high quality BCAAs and other bulk powders, hit up superiornutraceuticals.com 35 bucks gets you a kilogram. Shipping is fast. I've been extremely pleased with them. I used Biotest's tabs until I started taking mega doses of BCAAs, so I then switched to powder.
Again, I can't say enough good things about Superior.