Liquid Protein

Who has a source of Liquid Protein that you can buy in BULK so that you can create your own fruity drink without spending an arm/leg.  I am currently using IsoPure Zero Carb--getting great results with that and the Isopure Shake--but I am wondering if there is a liquid protein out there that I can just add to my freshly juice lemonade. 

Not looking for your favorite whey protein shake, am looking for a powder or liquid protein that can be added to juice.

Thanks in advance for your great advice on your favorite product.

 well... if u like strawberry lemonade.. unjury makes a strawberry sorbet protein powder made for water and lemonade.  it's not too bad, nice change from all the milk.

Isopure makes an unflavored protein powder - 25 grams per scoop. I buy it at Vitamin Shoppe.com
Hope this helps.