Protein

I've been taking Optimum Nutrition Pro Complex protein. I've gone through about five 5lbs bottle. I use to get it for around $42 a bottle from amazon, but now it's around $60 on amazon. I know it's the best protein on the market but it's way too expensive now.

Do you guys have any suggestions for good whey protein that are affordable?

I've tried Syntha-6 it was way too thick for me.
I've tried BPI Super Pro protein it was pretty good.

Only reason why i kept going back to pro complex is because it mixes really easy.