This are some japanese online shops I've bought from using the service provided by the website listed above:

Booksbe

Kacshop

Youclub

If you are interested in more japanese online shops feel free to ask me ^^.

 
These are some shops that ship worldwide. I usually don’t buy from them because there isn’t much of suikoden series.

Jpqueen

Mandarake

Happy Otaku Site

Everlastings Doujinshi collection
A really big doujinshi collection, that includes doujinshi from series like Hitman reborn, Naruto, Gundam Seed, Prince Of Tennis, Final Fantasy 7, and more.

Samurai Blade
Another big doujinshi collection that includes series like Samurai Deeper Kyo, Bleach, Gintama, Fullmetal Alchemist, Harry Potter, and more.

Suikosource
An interresting Suikoden website. Contains lot of information.

My deviantart
The place where I upload my drawings.

 

Spanish websites:

Suikocastle
Foro dedicado al Suikoden.

27 Runes
Página dedicada al Suikoden, está bastante completa.

Dragon Note

Foro de descargas, anime, manga, mitología, etc..