C.B.
I use Adventure Kids in Plano when I need just an hour or two sporadically; their whole niche is the no-commitment drop-in thing, but it's a "play"-care, not a day-care or MDO. There is an MDO program at the Valley View Christian Church in Carrollton (on Marsh just south of George Bush) that may be able to accomodate your needs and is convenient to Plano. Kids attend Monday through Thursday, 9-2, and ask if they have openings on specific days (my kid only goes Mon-Wed).