In most cases, you have to make new ones. Sometimes you can arrange privately with the artist of the original cover (if you like it and want to keep it) for the use of the artwork. But even then, you have to have type design and layout--you can't use that from the original, because that's owned by the original publisher.
In many cases, writers are eager to have new covers, because they weren't happy with the originals.
There's a growing cottage industry of folk doing book cover design, and finding clever ways to use stock art.
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