Spanish Classes...Lessons, Playgroups, Schools....for my Kiddos

My children are 9, 4 and 3. Their father speaks Spanish. I would love for us to be a completely bilingual family. Where can we go for help that is relatviely inexpensive? We cannot pay $1000 a month or so for one child to go to a "special" Spanish school.
So, what are the alternatives? Are there any great tutors, programs etc? I need to learn Spanish, as well.

Thanks