As far as just low down on teams/schools these two websites are good resources. They list the schools by region and conference. If nothing else, it helps to give a list geographically. For D2's http://www.d2baseballnews.com/
For D3's, http://d3baseball.com/teams/region/west
I don't know if you consider Texas as the southwest, there is a smaller D3 outside of Austin, Concordia which is about $36K all in, but they give decent academic money. Based on a 3.5 GPA transfer, $14.5K academic per year before considering financial aid. Unfortunately the words affordable and college are hard to put together in the same sentence.