Just don't, unless you absolutely don't care about money whatsoever. At best, you'll pay an additional 10-to-20 percent in service charges. At worst, you'll get jacked by an unscrupulous waitress or cashier who'll add a "tip" onto the total. And often clubs don't pay the full amount out to the dancers, holding another "service charge" from their end. Get cash before you come, in the amount you desire/can afford to spend.