Scrubbing and Scraping my Data- Help With Collection Property Owner Inf

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Hi!!

So I have a specific list of properties I want to mail too. Its a list with around 1000 targeted homes. I need help getting the tax billing addresses for each one.

I was going to hire someone from Odesk to clean the list up and find the property tax billing address on each property. Reason for that is some of the properties may be absentee owned, so I wouldn't want to mail their tenant, I want to mail the owner at their place of residence.

Other then allowing the person from Odesk onto my MLS account, which I do not want to do for obvious reasons, what is a good way they can collect this information?? Any websites that have it for free or small fee?