R.J.
In our area $50 and up is average I've come across for one off types, or once a week types.
Also keep in mind that 40 hours of childcare in our area for potty trained children is between $250-$600 a week. The YMCA charges $425 per month for 3 hours of afterschool care a day, or $40 per day... and they're (obviously) the cheapest thing around that isn't subsidized.