Fortunately, I have a (reasonably) local used book store and, when I don't mind opening a dead-tree book I stop by. They have a several "shelf-feet" of Ace doubles -- including some Westerns, which I never saw new. It's a nice walk down memory lane.
According to Wikipedia, the doubles ran into the late 70s or early 80s, but I can't remember seeing any after about 1968.
*Justification for inclusion in this topic: Jim Baen started his publishing career at Ace Books in the early 70s.
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