J.N.
Hi- I know this is late coming... I'm just seeing it. I am in the same boat and am looking for care for my 1 year old also, but for only one half day a week... it tough to find! I did want to tell you about The Lighthouse at Collin Creek Community Church. They have a half day program that is 9-12:30 or regular pick-up at 2. I know thats not perfect for your 8-12, but it could be an option and they are fairly reasonable.
I was hoping to find a moms co-op to swap child care but I can't seem to find one.