One of the best things I have learned since becoming a Realtor is the inaccuracy of online services! The public can't be trusted to enter correct information. Would you really want your neighbor knowing that you paid 130,000 for the 155,000 home? Probably not.
Public record is the way to go. In Arkansas you can find some public record information online at ARCountyData.com or your county's website.
It is important to look for homes similar to yours (sq footage, age, area, condition, floorplan) that have sold in the past 6 - 9 months with in 1 to 2 miles of your home. Or better yet, in your same subdivision.
I usually don't go less than 6 to 9 SOLD properties if they are available.
Also, it is important to find out what properties were on the market that have expired or been withdrawn. This info can show you a very important ceiling in your pricing model.
Also, find out the average Days On Market or (DOM) in your neighborhood/area. If your average is 120 days, then that means that homes that have sold in less time must have also offered good terms to the buyer (i.e. paying closing cost, giving them all the appliances & so on).
Valuating your own property is tough to do. They say most homes that are SOLD through "For Sale By Owner" are initially valued 10 - 30% higher than the actual market value & wind up selling for 25% less than actual market value of those homes comparatively sold by a Realtor.
It is probably a good idea to contact a realtor. Many offer FREE home evaluations (I do), but be sure to pick a good one. A lazy realtor will give you no more data than you could have collected on your own.
One of the things I do for my clients is visit the homes in the area that have recently been sold so that I can make more accurate adjustments to the home values based on what is in them & I find out the TERMS of the contracts if they allow.
That is our JOB & I take great pride in collected this data!