how to buy property for less than valued?

One idea that I have is that you can always offer something less than the advertised value because of the defects that you might find in the property.

Hopefully, others will also come along to respond your question.

Shop around

Find someone in a really bad situation, divorce sometimes, loss of a job, finding it a month or so before the bank actually forecloses.

If you have the cash or a line of credit that allows you to write on it, you can buy at foreclosure auctions and tax sales.
Find houses that have been on the market for months andmonths sometimes.

I think the best way to buy property cheap is to find properties that are about to be lost to unpaid property taxes. You can do this by contacting owners of properties that are on a tax deed sale list or a tax lien sale list, depending on how your state does things.

Many of these properties are inherited and/or unwanted, and the owners will be willing to give them to you extremely cheap just to get them out of their hair. Tax sale pre-foreclosures are all I do and I keep plenty busy!