So... question.
What is the Cheapest (worthwhile) protein powder available? Im not too worried about whatever else is in it, since I need to consume more calories anyways (in fact, the more, the merrier!)
That, my friend, is a type of question I like to refer to as "a key to the floodgates".
Here's your primary problem: There are probably HUNDREDs of BRANDs of powders alone (not counting flavors and such). That being said, you also can't determine 'cheapest' at face value, what with discount cards, coupons and the like. I would highly recommend the brand I bought (BioChem Sports) but do yourself a favor and check out the brands others have mentioned here.
Also, "the more the merrier" (regardless of source) on calories is a poor stance to take. If you're going to be taking a supplement, as Chris has taught me, make sure it's a high-quality supplement. Most of the things in lower-quality items we avoid are generally non-caloric anyway.
Chris: Mass media makes me Hulk-like. Alliterations for the win. That is all.