Fellas

I know there is a fair few fitness gurus on here, I would like to know if anyone can point me in the direction of some good quality low fat, low carb protein powder.
At the moment I buy it in 4.5kg bags I think, but it is not lasting me the whole month so I am after a 5kg bag for around $120 - $150.
I buy protein every month so if I can get a good deal locally it will be easier than buying over the net etc.

Thanks