As a father of two wonderful little girls (my oldest turns 4 today actually), the only time I get to play games is after they go to bed. As much as they enjoy getting presents, it's obvious that the happiest they are is when I'm spending time with them (and mommy), even just sitting around playing blocks or sitting there while they show off their dolls to me.
If you're having that serious of a money issue that you don't even have more than $25 to your name, and you expect to be taking care of a kid, sell the damn computer.