I think you mean amazon.com
Ebay is an online auction page while amazon is just a general store page
they got it on both sites, though.
Here's Dark Horses official page for Shaman Warrior;
http://www.darkhorse.com/Search/shaman+warriorBut yea, I only think they sell to stores internationally. Id be surprised if they sold small quantities as well. While series like Naruto has a huge young fanbase SW mainly turn to older readers who got money. Although young kids normally spend more then grown kids... but this is quality and I would bet a lot of people wouldnt mind paying for it. I didnt. Then there's Blade of the Immortal thats awsome too but they continue to scan that one as well... but its around 20 volumes, so... I dont know. I guess many diffrent factors plays part of the reason.