If you have a realtor helping you, he/she can find out more information about the property --- like if it's even for sale, who own it, etc.
But looking online for properties for sale may not be the most efficient way to do it since so many "listings" are either outdated, or what you see is not even for sale
Finally, if you aren't paying in cash, and will need to get a loan, are you already preapproved to buy property, what type of loan can you qualify for, and for how much? Some properties may not be FHA-approved, and as such you may need to see if you can get another type of loan.
There are many realtors on this forum who will be glad to help and guide you.