I am a Real Estate Appraiser, but you really dont need one unless you plan on selling it FSBO.
Find a Real estate agent and they will do a BPO for you, which should give you a detailed sales analysis for your neighborhood and home.
My wife is a Realtor with ReMax and I am sure she would love to do one for you(BPO) at no charge. If you want her to list your home on the Real Estate Websites you can discuss that with her too.
Regardless, she can do a BPO for Free!
Send me a PM with your contact info if you want me to get her in touch with you.