Damn, I was going to hit up my favorite supplement store by my house that hooks me up with online prices.. They have isopure (3 lbs.) for $34, but after comparing the difference in profiles per scoop, IMO it's a big difference if it lives up to label claims. I'd pay the same price for an extra pound of TP's ion exchange...($34 for 4 lbs vs. 3)
2 scoops of Isopure Contains:
Protein: 50 grams
isoleucine: 2.7 grams
leucine: 6.8 grams
valine: 5.5 grams
True Protein Ion Exchange: 2 scoops
Protein: 56 grams
Isoleucine: 16.4 grams
Leucine: 23 grams
Valine: 13.8 grams