The proper way to get the Market Value is to contact a local Realtor and have them do a CMA; Comparative Market Analysis.
This is just one of the services that Realtors provide to their clients,
and one of the many ways that they are valuable.
Realtors invest a lot of money in their education and tools so that they have access to research for their Client's benefit.
Please call a Realtor.
Good luck and may God bless