Wow, I had to really put some thought into this one.
I think my very first purchase was my virtual fax line. Next was my website. Next was a glass of wine. (It was a celebratory kind of thing.) After that, it was the standard office supplies (pens, paper, cheap adding machine, etc.) Then I stopped buying things and decided that I had to "make do" with what I had for a while. I really did have everything I needed, so shopping at that point was really just "shopping" for the sake of...well, "shopping".
I did steal my son's bulletin board that he wasn't using anyway, and even though I purchased it initially, it still feels more like stolen goods, so I will not count that in this survey.