Buy 2 lbs of protein and get 5 lbs free

Go here
http://underground.nutrex.com/promo/

Click the get your 5 lbs free button

Close the little window.

Then look for Muscle Infusion Black 2 lbs, whatever flavor you want
(also while you're scrolling down, lol @ "Hemo Rage Black", which sounds more like something awful coming out your cornhole rather than something you'd want to drink)

Add to cart, select your shipping option, Checkout

Then use one of these promo codes:

* For Chocolate Monster:
Use PROMO CODE: MICMFREE

* For Cookie Madness:
Use PROMO CODE: MICKMFREE

* For Vanilla Beast:
Use PROMO CODE: MIVBFREE

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As far as the flavors, from what I've seen around the web, Vanilla beast is not that great, good review on taste for Chocolate and Cookie.

$37.45 for 7 lbs of protein is a pretty good deal.