Cheap: "party" beer. I'll go Busch Light over Bud Light any day, mainly out of the convenience of using a $20 versus 24.65 or whatever. I'd rather use that other 5 bucks on non-shitty pilsner beer.
Fast Food. Can't remember the last time I bought a combo instead of dollar menu items.
Expensive: Clothes. Polos/Sports shirts I usually splurge on. Still wear cheap shorts and usually just get ties from tiebar.com.