J.M.
We send our kids to Next Generation Children's centers in Natick and now in Sudbury When I was looking around, it was pretty middle of the road in terms of cost. Bright Horizons was more expensive, some smaller single-center centers were less. And home daycare ran about $200 less per month. Anyway, NGCC ran around $310/week for a 9 hour day, including lunch but not including diapers.
Anyway, you're going to have to shop around if you want exact prices, but I hope this helps.