Best place to get historial sales data (except of Zillow)

[Justin Brin]

Dear forum members,

Where is the best place to get historical sales data for a metro/city/zip code?

I know Zillow provides data but do you know of any other platform that you can export historical data?

I will like to also compare Zillow data with other data sources or for locations Zillow doesn't have much data to have a backup source.