I ordered a 500g bag (actually 5 100g bags) of it off of e-Bay and it works great. I didn't need nearly that much as a very little goes a long way.
I see that you're a JJ guy, BJJ I assume? Me too, purple + 2. Drilling and long sparring sessions are a breeze with this stuff!
If you are interested, I might still have the sellers info. Dunno however, it's been well over six months since my order.