The store has a revolving list of titles new and old. I would suggest first checking the online store. If they dont have it on there, you should be able to call the store for an inventory check during normal business hours.
I usually call them when I'm looking for something. Most of the time they have what I need. If they don't have it, it is probably a very rare item and you may only be able to find it online. Sometimes if I don't find it at Amoeba, I'll also try the Last bookstore in DTLA. They have a way smaller selection so it's a shot in the dark but once in a while I get lucky and unexpectedly find something there that I was searching for.
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