Strong Tower Publishing maintains a Directory of Prewrath Churches.
There are many more prewrath churches out there than is listed in that directory. So if you know of prewrath pastors, ask them to submit their church to the directory to help build up the church listings.
Disclaimer: I do not believe it is a sufficient reason to attend a church simply because it is prewrath. There are other important doctrines and practices that should be considered. Further, a church claiming to be prewrath may not truly be representative of the prewrath position. So be discerning and prayerful.