Life In 19x19

If I remember correctly, one of my friends was 6d on goproblems while he was 2d KGS and 4d/5d wbaduk.

I usually just go through games quickly(10-15 min. cca) on my computer, and I think that improved my knowledge of shape by a great deal.

I want to know where should I order my go books.
I live in south-eastern Europe, not in EU.
I am mostly interested in English books, but would also like to buy some foreign tsumego collection( Lee Changho Tesuji, for example).
I remember there was a book store in EU that offered free shipping on ...

I also registered a few minutes ago.
the server is a bit slow at the moment, but everything looks great.