As a lot of people have pointed out, the various POD and PDF websites which currently exist mean that there really aren't many RPGs that are truly "out-of-print" any more. I dig through all sorts of sources when looking for out-of-print stuff...but mostly it comes down to opportunity, and since I'm not doing a lot of tabletop playing at the moment, I can wait. That means "Bundles of Holding" might be an option, but in a lot of cases I've actually got the games within. Second hand bookstores can be pretty hit or miss, and when looking for a specific book it's pretty useless.
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