I’ve always wanted to find books at prices I’m willing to pay. Sometimes that’s under market, sometimes it’s over. Value is a different proposition for everyone. Sometimes it takes a few years to find that thing at that price. Either I do, or I keep looking, or I lose interest and forget about it because it wasn’t that important anyway (this last one has saved me a bit over the years).
In the past few years I’ve learned about my habits as a collector. I like to make acquisitions. It scratches that itch whether it’s a $1 book or a $1,000 book. Having a few foci at different price points helps. As someone else mentioned, I’m working on DCU variants. I’m also filling in a Nam run at $1 apiece and recently re-completed Robinson’s Starman through a similar hunt. Starman took about 3 years, but it was enjoyable. If there are other books I would like but can’t find or afford (or simply don’t want to afford at today’s market price), then I can be patient and wait for my opportunity.
And I’m constantly glad that I bought most of the early/key ASMs back in the late 80s when I could afford them. That also helps. But if I hadn’t the same principle would apply.