Grain Belt was always the most insanely cheap beer we could buy, but we very rarely did.
When we bought half barrels, it was almost always Busch Light Draft, affordable and drinkable; $33/barrel at Riley's.
Halloween (actually 10/30) 1993, after Wisconsin beat Michigan, we went through the first barrel in like 15 minutes. It was going so quickly that we basically never shut the tap off (kegerator, not hand pump). I'm trying to remember what we bought 12 packs and cases of, but I honestly don't.
We drank Mickeys when we were drinking malt liquor, then my officer basic course roommate had me try OE and one other, but OE was the one that he and I drank when he was "educating me" on Friday, Glory, and some other movies I don't remember (but I do remember those).