I don't think $120 is such an unfair amount. What you gained from the relationship was immediate service. The guy solved your problem for you straight away. There are certainly enough LBJ threads here, mine included, that you should have been able to finish by yourself anyway. But on the other hand, the rates charged are why I do most of my own work, including the LBJ's, and the reason sites like this are popular. That being said, if I was a tech and someone brought a vehicle in for a tail light bulb change, you better believe I'd charge them at least $15 (CAN? $10), if not more.

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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick