Twitter is expensive

I follow quite a few people on Twitter, and one of the things that happens is that it ends up costing me loads of money.
People share pictures of the book they've just bought, or other items. It's often the impetus that I need to buy an item I've been thinking about or, in the case of a book, something that I'd not seen before and now need in my life. I've bought technology, clothing, resources, CDs and DVDs, loads of books and all sorts of other stuff...
Twitter is an expensive habit...

What's the most expensive thing you've bought because of a tweet?

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