The last time we were in Book Nook, James picked up a copy of L. Neil Smith's The Nagasaki Vector; he had all the "Win" Bear/North American Confederacy books at one time, but about half of them disappeared in the course of three moves. I said impatiently "Well, why haven't you looked for them online?" and clicked around on Amazon.com and found a bit worn but acceptable copy of The Probability Broach, which arrived Saturday and which he's been reading ever since.
Happily, we also found another in the series, a later publication (2001), which he didn't even know about, The American Zone. That arrived in today's mail and there was a gleam in his eye about having found a new book in a series he already loved...so understandable to me after finding Verney's Samson's Hoard and Frost's Fireworks for Windy Foot, not to mention L'Engle's last novel. It's like finding a long-lost family member.