Where do I find the actual market value of a house? Do not want to pay over!!

[Victor Rios]

Hello, I am looking for a single family home in the Houston area and look into websites like HAR.com, Zullow etc....The list price I assume is not the actual value of the house.  Where can I find the value of what I should be paying for ? I am trying to buy a house under the market value. I do not want to pay over of what it is worth... Any feedback will help...