Open bar it is, then!
We'd started out thinking we were going to have a cash bar, because we would not be able to afford an open bar. Then one of the staff at the club where we are holding our reception realized that because our crowd doesn't drink much, it was not worth it for the club to get an alcohol license for the night--they just wouldn't collect enough from a cash bar to cover the cost of the one-day license.
Then we were going to host a couple of signature drinks (one alcoholic and one nonalcoholic), and that is all we would serve. So tonight, I was talking to the owner of the club which will be our reception venue, and trying to work on the mechanics of getting the champagne for toasting and for our alcoholic signature drink. He finally says, "Ok, you pay me $250, and we'll just have a full open bar for the night."
Umm, ok, that's $250 for a full open bar for 75 people for five hours? Needless to say, I accepted on the spot, and sent him an e-mail to confirm the moment I got home. I guess we're having an open bar after all!