Use the Links list, published on the right of the KAL home page, in order to see some of the books in the 'Let's Knit Series', on Amazon Japan.
Order them directly from them, or copy the ISBN number and search them in other shops.
Click the button above to get to YesAsia website, then search in Books by ISBN number or by keywords. 'Knit' is a good keyword to start with.
The website is all in English and they offer free delivery for most of the books.