This is a pretty impossible question to give a good answer to. There are many many factors that play in to how much child care costs, depending upon where you live, what's available, whether you want to put the child in a childcare facility or a private in-home childcare business, etc.
Your best bet would be to call daycare facilities in your area and ask what their fees are, and also call your county social services office or community action program as they can give you names of state certified child care providers that do child care from their homes. Private childcare is usually cheaper then taking them to a big facility. In the alternative you may be able to find childcare providers advertising in the newspaper. Give a call and find out what they have to offer.
I have owned an in-home childcare business for the past 11 years. I have a great reputation and glowing references. But please remember, THIS IS NOT ALL IN-HOME CHILDCARE PROVIDERS. Your child is PRECIOUS cargo, and you want to make full well sure that your child is going to be cared for correctly in your absence. If you even have the SLIGHTEST doubt about a facility and/or private caregiver, GO WITH YOUR GUT INSTINCT and RUN AWAY FAST. I can promise you that if you have ANY doubt about the care your child is receiving, you will not have a productive days' work, because you will spend your day worrying about your child. It is a BIG decision you have to make and it should be taken with most seriousness and your child's best interest at heart.