Depending on the day and what bar you go to you can spend anywhere from 60 bucks to 5 bucks for the whole night. On Thursday night it's .25 draws at one bar and $6 buckets of beer at another place. I need like 4 beers and I'm done, I've gotten to be much more of a lightweight in my old age. Cover isn't too bad around here, the most expensive I've seen is $5.
The most money I ever spent was on a Thursday night at the bar with the quarter beers, but I decided to drink vodka tonics (like twenty of them I guess) and shots which obviously not a good idea.
I don't like to spend money when I go out though, so I usually find someone to do it for me.