When I was 11 years old, a cool aunt of mine gave me a copy of the Overstreet Price Guide for my birthday.
The 1986 edition for the 25th Marvel Anniversary. I had a small collection at that point.
The most compelling page was an ad for Fantasia, a comic shop in Yonkers, NY. In this ad he displayed a showcase with multiple copies of Action 1, Superman 1, Detective 27 and other Golden Age keys. I used to stare at that picture for long periods of time. A few years later we went to visit some family who lived in White Plains - I made sure we were going to visit his store since we were in the area. It was a small store, and the big keys were only displayed on weekends. He had some cool baseball items including a ball signed by Babe Ruth. Daniel Dupak was the name of the owner as I recall. I purchased a FN copy of Batman 120 for $20.
The thrill of the hunt was on.