Back when I was in highschool the Dragonball mangas were 5.20€ per volume (except Vol42 since it’s bigger).
Naruto 5.00€(GER)/5.20€(AUT), One Piece same.
Soul Eater 6.20€ here but had a promo even printed on the back where the price is for -50% until March 31th 2010.
Those are German translations, btw.
Bleach is 5.60€ per volume.
Looks like they raised the price to 5.95€ (GER) though for big series like Naruto and One Piece.
But…I don’t know if you can even get the Japanese or English versions here. Never seen a section for English manga in comic book shops.