D&D 40th Anniversary Blog Hop Challenge Day 21

First time you sold some of your DnD books--for whatever reason?  I sold my copy of Return to the Temple of Elemental Evil on eBay several years ago.

I rarely use modules and it was going for crazy money.  Part of me regrets it though, as I have developed a keen interest in the Temple, but instead of the module collecting dust on a book shelf, I was able to pay off some bills.