Kinokuniya is the best place for manga PERIOD. it may not be used, but its a sure shot at WHATEVER YOU WANT. seriously, they have everything. i bought naruto 1-6, dragon quest this and that, the book Hagakure (very good btw) and Bushido. the english manga is a little spendy, like 7 bucks. but if you want cheap manga, you'll have to opt for the japanese versions. kino is in the back of uwajimaya (the best and only[IMO] place for pocky and cricket cola) in beaverton. i drive 80 miles to get there whenever i want manga and stuff.
try the gentlemen's pocky. trust me.