I was thinking about this question, so I decided to search the forum to see if it had been asked in a topic within Bitcoin Discussion before.

I managed to find this topic, posted in February 2013: https://bitcointalk.org/index.php?topic=146018.0

Bitcoin was sitting around $25 then around that point and continuing to rise.

So what is the most expensive thing you have purchased using Bitcoin?

Let's not consider trade amounts, I'm thinking more like tangible items or services.