When I was working we paid Rainbow around $220/week for FOUR days. As she got older and the staff-child ratio could increase (from 4:1 to 7:1) it dropped down. Not much. Eventually we got to around $185/week for FOUR days. And these prices are about 2-3 years old. But it was one of the higher priced centers, you can find better rates out there. And the in-home programs are less than centers. My hubby wouldn't go for in-home, though, so we paid a lot.
Whatever you end up selecting, make sure you take advantage of the Flex Spending Accounts for child care. You can donate up to a certain dollar amount. It is pre-tax. That means your dollar stays at a dollar, it is not taxed at 25-35%, leaving you 65-75¢. It REALLY helps pay the child care bills. But you must submit official forms signed by the center in order to access the funds. No biggie. Ask your employer for details. It's very worth it. (do the same for medical expenses...co-pays, prescriptions, etc...makes your money go farther.)