If you're moving to the metro area, there's a non-profit that can help with researching. It is:
Child Care Resources
Need Child Care? Don't know where to find it? These folks will help you do just that. In English, Vietnamese, Amharic, Somali, Spanish and Russian!
Serving Seattle/North King County, East King County and Seattle/South King County.
http://www.childcare.org/
Location:
North: (206) 329-1011; East: (425) 865-9350; South: (253) 852-1908
As far as pricing, I have a 2yo in a day care center in Bellevue WA and it is $200/week. Infants are closer to $250 per week, and there are more expensive options in town. However, Bellevue is very pricey compared to the outlying areas, and home day care settings are less expensive.