Whereabouts in the Dallas area are you moving? I live in Plano and for my 3 year old I pay $20/day for drop-in care (I think otherwise it'd be ~$80-100/week) and for your infant, I would expect to pay $150-200/week.
Also, I sent this out this week -
I have seen several requests for babysitters, I'm a single mother and gave up a social life years ago. I work Sun-Tue and every other Wed. if someone needs childcare to work, go out, or if you need sick care on Wed,Thurs,Fri,Sat I'd be willing to help someone out. I live in Plano and my daughter's almost 4. Will not charge an arm and a leg, I know what it's like to just need some help. (and my daughter wouldn't mind the playmates!)