You can see a list of higly ranked journals in this field at Google Scholar together with the h-index at https://scholar.google.de/citations?view_op=top_venues&hl=de&vq=eng_datamininganalysis

You can search for the impact factors of specific journals at http://admin-apps.webofknowledge.com/JCR/JCR

As far as I know, all IEEE and ACM journals are free of charge as long as you let these organizations manage the copyrights.

e.g.

IEEE Transactions on Knowledge and Data Engineering, and

ACM Transactions on Knowledge Discovery from Data

have an excellent reputation but are also very competitive.