Yes. Optimum Nutrition has one, I think its called 100% Pure Whey.
I also believe trueprotien.com sells all theirs 'plain' if you look under the right category.
There is another brand called Any Whey protein. It's touted as "virtually tasteless" so you can add it to just about anything.
Here's the scoop (no pun intended)
Nutrient Amount %DV
Calories 70.
Protein 17g
Carbohydrate 1 g
Dietary Fiber 0g
Sodium 30mg
Sugars 0 g
Vitamin A 0 g 0%
Vitamin C 6 0%
Calcium 8%
Iron 0%
Per Serving: Protein Blend (Whey Protein Isolate, Whey Protein Concentrate, Whey Protein Hydrolysate), Natural Flavor, Lecithin.