Green Bay is a town of just over 100K people. The number of active providers has got to be small and you will have stiff (pun intended) competition with other guys in from out of town (including press, media, giant fans, etc.) for those that are working. If the girls are smart they will double their price for the weekend.
Perhaps the better option is to stay in Milwaukee, rent a car and drive to Green Bay for the game (you can do it in under 2 hours.) In Milwaukee, you will have at least 10 times more options. Some or all of the cost of the car rental will be offset by the lower airfare and not having cab expenses.
Regardless of which place you go, it can't hurt to put up a M4W add in both the Milwaukee and Green Bay CL ES section starting today.