Tax Lien sales in St. Louis City

[Katina Stewart]

I'm looking to purchase property through the City of St. Louis Tax Lien sale auction.  I have two questions...1) how do I find out how much a property has sold for during the previous month's tax sale? I'm looking for this info to get a better idea of how much to bid for properties.  2) Is it possible to contact the current owner and buy it before the tax sale?