Listsource- My county does not have pre 2001 tax data

[Carson M.]

I have pulled a list of 1600 absentee owners with high equity for a target area.    I put my last sale date from 1900-2013. 

As I look over my list, the earliest sale date is in 2001.  There should be many homes that sold from 1900-2000 that would of ended up on my list.

I called Listsource and they looked into the issue.  According to them, the county in which the cities are located in does not provide tax info prior to 2001, making it impossible for them to produce leads from 2000 and before.

How the heck can I build a list of absentee owners and get around this?  I would prefer to hit homes that were sold pre 2000 more so than homes sold after 2000, which makes this data vital. 

Has anyone gotten around this problem before? Would different list generation websites be able to pull the full data I'm looking for?