How to find a birth parent for free?

[Katherine Hall]

I was adopted by my grandparents when I was born. My birth mother passed away before telling me anything about my birth father. All my parents remember about him is that his name was kevin miller and that he was two or three years older than my birthmom. They lived in garden city kansas and his parents owned a electronics store that burned down. If anyone has any ideas that would help me find him I'd greatly appriciate it.