Bas Bleu is a bookseller by post which is a melodic way of saying we are a mail order company that produces a catalog of books and bookish things. We sell books and gifts that offer elements of wit and wisdom and joy. Our selections are eclectic and rarely appear on bestseller lists. Bas Bleu is a bookseller by post which is a melodic way of saying we are a mail order company that produces a catalog of books and bookish things. We sell books and gifts that offer elements of wit and wisdom and joy. Our selections are eclectic and rarely appear on bestseller lists.