I bought the one for my senior year in high school and college.
They are around here somewhere.
I went to the 40th high school last year. For about an hour, for the sole purpose of seeing two people that said they would be in town for it.
Me and my wife had a snack and took over an out of the way table. They arrived and got something to eat, we discussed the matter of mutual interest that had come up before (using FB to support outside websites/businesses), then we left. They said they stayed for a bit longer, but they left before the music started and the dance floor got going.
Not exactly a trip down memory lane with people I didn't like then, and, for the most part, don't like now.
I still have all my yearbooks and I went to 2 reunions. One was a friend's reunion and the other was a class reunion. The class reunion was okay but the people I really wanted to have there weren't present and the people who showed up were all trying to outdo each other.