Secondhand Japanese textbooks / reference books

Hey fellow JSL students,

I'm looking for Japanese textbooks or reference books at intermediate level. Passed 3 kyu and looking to get just a little closer towards 2 kyu while I am still in Japan. If you have passed 2 kyu and/or have good intermediate books to give away / sell at a reasonable price, please get in touch! I'm especially interested in the following titles but am open to recommendations:

1) CLAIR correspondence course Advanced Level + CDROM.
2)Integrated approach to intermediate Japanese
3) The complete masters series for 2kyu
4) 500 Essential Japanese Expressions: A Guide to Correct Usage of Key Sentence Patterns (and workbook if possible)
5)Nihongo Gogen Jiten

And also I'm going to Seoul during the Spring vacation, if anyone can lend me a travel guide for Seoul/SKorea that would be much appreciated!

Thanks,
She Peng