I don't know why you need very rare or ones that haven't been posted here?
But I agree with Calico... write your own :) You know your wishes, your heart, and your goals better than anyone, so why not write a spell tailored to you?
I don't really like the term "wish spell", because to me a wish is different than a spell. A spell is more... active? Involved? You can write a spell to obtain something you desire, or try the "Law of Attraction" technique :) Wishing is like leaving it up to fate to decide.