Daedalus Books is an online bookstore that offers the residual, unsold new books, but you might want to give them a second chance. Their prices are really cheap, and you can get a discount of 10% if you sign up for their email list.
They are shipping worldwide, and the cost depends on the weight of the shipment. It might take 3-6 weeks for the shipment to arrive.
Booktopia is an online bookstore based in Australia, that offers:
Free shipping isn't available to everyone. Booktopia sends you an email when that option is available. During that time, you can pass the code to a third party (friend, family member, colleague, etc.). This is done because their shipping price is fixed, no matter how many things you order in one go. It's always $6.95.
This store offers their services only in Australia (including the rural areas) and New Zealand.
Paperback Swap is an online bookstore that is a little different because it lets you swap books with other users on the site. If you have a book to offer, you list it on your profile. For each book you send, you get one credit. You can use that credit to request a book from someone else, or to get a discount for the books this store offers.
For registering on this site, you get two credits, which means two books free of charge.
Harlequin is a Canada-based online bookstore that has offices in Toronto, New York, London, Tokyo, Milan, Sydney, Paris, Madrid, Stockholm, Amsterdam, Hamburg, Budapest, Granges-Paccot, Rio de Janeiro, Mumbai, and Istanbul. Their literature is romance-inclined and for women.
It offers discounts on shipping:
They offer it to the first time buyers
Returning customers - for $15, you get free shipping; if the order is above %15, it is automaticaly free.
There are many subgenres of romance that Harlequin offers, such as, African American, classic, contemporary, erotic, fantasy, historical, home&family, inspirational, passion, relationship, romance with more.
Audio Books Corner is an online audiobook store that is available worldwide. It also offers some free downloads. There is no monthly subscription. No extra softwares needed for playing their audiobooks.