And he just sold a bunch of his doubles, ha.
Sure did. I am always keeping an eye out for DCU variants and upgrading when I can. Most aren't worth all that much. The WW #90 is hot because of Artemis, and it is one of the few real keys that has a DCU variant (plus none of the WW books are super common to begin with). Cartoon books like Pinky and the Brain are also uncommon, though you can buy sealed two packs fairly cheaply (or at least they used to be). Most DCUs will sell between $2-5 apiece or so, which isn't bad for books you'll find in most dollar boxes. The better ones can command more, especially if you find the right customer.