I bought a 5 lb bag of whey protein at my Nation Discount Nutrition store, for $28.00. It is called Big Whey, and is made by Next Proteins International. It mixes great in water with a shaker!
Same amount of WPC from the protein factory and you can get it cheaper (i think it was $4 a lb). You also pick what you want it sweetened with, and have a choice of 6 flavors. Label guaranteed.
Eas has good deal on simply protein. 80 servings for just 26 bucks if you order from dpsnutrition.com. it's also got 20-22 grams of protein/serving. BTW the vanilla is good too.
www.nutritionmegastore.com is the place to go. Their prices are the lowest around, plus you get free UPS shipping on all orders over 100 bucks. Their only downfall is that they are often out of stock and it takes awhile for you to receive your items.