E-books: Some e-books are available here
Welsh books for learners:
The Lolfa has a special series of new books for Welsh learners - The 'Ar Ben Ffordd' series.
The series is a collection of six books, 2 books for each level - Entry, Foundation and Intermediate. The books are a collection of entertainment, short stories, articles, interviews, jokes & puzzles written by experts in the learning Welsh field and well known authors, such as Bethan Gwanas, Lleucu Roberts & Geraint V Jones
Y Bont: Welsh Reading Books for the Family
There are some novels for learners on sale at amazon
Welsh books are sometimes available on e-Bay, especially those that are now out of print.
The Reading Agency
Local Welsh Book Shops
Also remember to visit your local Welsh Book Shop.