You don�t say how old your kids are but I know that moving children during a school year can be difficult, as you are experiencing because places are filled, but also very unsettling for them.
It might be worth considering you and the children staying where you are until the school year finishes in the summer and your husband commuting at weekends and staying locally during the week. I know this adds extra cost but his new employer might be able to help and in the long run it might be the best investment you make for your kids. Also, his job might not work out and you�ll have relocated for nothing.
Just thought I�d throw in another idea. Good luck with your move.