Hi L.,
My son goes to an all day, all year long MDO program in Plano. It is called Kids Kove. We have been going there for about 18 months and really like it there. Yes, I got tired of the all the breaks, summer and all of that, so this MDO program goes on a 2 day or 4 day rotation, whichever works for you.
Their website is www.harborpointcc.org and then click on Kids Kove and you can speak with the director there. Her name is Pat Bray and she can give you further information and a tour. You did not specify where you lived so I am not sure if this location is good for you. I checked out about 15 schools in the Plano, Allen, and McKinney before putting him in here. That was the deciding factor for me is that it was all year round!
Good Luck!
G. B.