Wholesalers - Which lists are working best for you?

[Jason Palmer]

I'm looking to increase my marketing efforts immediately by mailing 8,000-10,000 postcards/month, but don't want to waste money and time targeting the wrong lists. I already mail ~4,000 per month to absentee owners and we're getting about a 2% response rate, but our leads are low end/low profit properties. Has anyone here been tweaking and refining your list with good results?