Visiting Seattle help

Are there any good secondhand manga and manhwa shops in Seattle area?

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Starting this
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Csm boxset vs death note box set

Thinking of what to get for my birthday since I love both of the series what do you guys reckon ?

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[DISC] - Getsuyoubi no Tawawa - Ep. 567
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[DISC] Muryoku Seijo to Munou Oujo / The Helpless Saint and the Powerless Princess - Ch. 14
https://mangadex.org/chapter/fa53cf1c-00c8-41eb-90d0-28023010d692

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Any recommendations for manga like this one?”
https://redd.it/1pybr83
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[DISC] Kurai Anoko to Shitai koto - Ch. 72

https://redd.it/1pychqb
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[DISC] Mercenary Enrollment - Chapter 269 (KAYdoesitsolo)
https://mangadex.org/chapter/e0bcea31-b064-432b-a9aa-0516630491ae

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Help me find this manga

Its about a mc being trained by someone in a separate space/dimension by 2 or more girls. The girls are sealed in there and the boy finds a way to undo the seal after his training is done. After he left the sealed space/dimension, I think he goes to a school.

Its not accurate since this a more or less a decade ago of my memory and I forgot the reason why the girls are sealed and how mc end up there.

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