http://www.rightstuf.com - Huge selection. Great place! Probably the best for all anime and manga needs.
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http://www.animenation.com - Huge selection including Japanese magazine subscriptions not found from The Right Stuff.
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http://www.amazon.com - Low prices. Excel Saga #2 DVD costs $22 here. It cost $26+ at The Right Stuff and Animenation.
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http://www.ebay.com - Insanely rare items! Even rare doujinshi and hentai can be bidded on! Of course there's alot of rare manga and anime too!
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Barnes & Noble has alot too. I don't know their web page.
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Enjoy!
