the true whey is even cheaper at iherb http://www.iherb.com/Source-Naturals...59-g/8180?at=0
thanks for doing the legwork on this, I was looking for just this kind of breakdown!
I can vouch for the Swanson version also. I get other supplements from them also and they have some of the best prices on the internet.
I also use Shawn Phillip's Full Strength shakes in the morning sometimes instead of breakfast.
I just checked over my protein for it's price/gram, comes out to 4cents per gram of protein, 3.6cents with the in-store discount I got this time (That's Canadian, and even though we're right at parity with the US dollar, prices in the states are still 10% cheaper for most things).
InterActive Nutrition Absolute Whey, 2.27kg tub of unflavoured. Regularly $70, was discounted to $63 this purchase.
They don't say anything specific about Grass Fed, but their whey comes from New Zealand and they don't add anything artificial to the mix.
I didn't like the rules you gave me, so I made some of my own.
Strong people are harder to kill than weak people, and more useful in general. - Mark Rippetoe
I'm not sure if the price was changed recently (it's been $80 since I first tried it) or if you typo'd it when you created your spreadsheet, but the higher cost makes it a much worse value than most of the other products you list.