Since my Amazon Buying Guide for Singaporeans has been getting a lot of good feedback, I'll write one for Book Depository as well. This guide is written for Singaporeans or those living in Singapore.
This guide is relatively straightforward because Bookdepository.com does ship to Singapore.
Is Book Depository cheaper than Amazon or other online bookstores?
Based on my experience, Book Depository is sometimes cheaper for items with low retail price to begin with. So books costing around US$10 is more likely to be cheaper on Book Depository than on Amazon, as compared to a $20 book.
Note that shipping charge is already included into the list price on the Book Depository website. If you're buying just one or two books, Book Depository is usually cheaper because other online bookstores have a per-shipment charge in addition to a per-item charge. So Book Depository is nice if you want to buy a book occasionally and Amazon is good if you want bulk purchases.
You can change the currency listed on Book Depository. There are only a few choices though, and Singapore dollar is not one of them.
Before you buy
It's advisable to create an account with Book Depository before your purchase. That way, you'll have your own account page where you can look at your history of purchases. You can also buy from Book Depository even without an account though.
For orders to turn up in your order history, you've to sign in before purchase. Otherwise, your order history would be the email they send you after your purchase.
Another thing to do before you buy is to search online for discount codes. Sometimes Book Depository gives out discount codes during special promotional events.
Different type of payment
Book Depository accepts major credit cards as well as Paypal.
For Paypal users, make sure your mailing address is accurate. Book Depository only mails to that Paypal verified mailing address.
For Paypal payment, just click on the big Paypal button on the payment mode page, and you'll be brought to Paypal's page where you have to sign in, inspect your order and total amount, and then confirmation. Straightforward.
After your order is created, they will send you an email confirmation.
Book Depository usually ships within two days upon receiving the order. After which, it takes roughly two weeks for the delivery.
The item will be mailed to your mailbox. If it's too large, then it will be sent to your door step - if you're not around, a note will be left by the delivery guy (could be from Singpost or other delivery companies).
The books are usually packed in either bubble wrapped envelopes or slim cardboard packages. So far, I've not have any books damaged during shipping.
Once I received a damage book, and Book Depository sent me a new copy after I provided them with photo of the damage.
It's pretty hassle-free to buy from them.
The only downside is they do not provide tracking number for deliveries. So it can be quite nerve wrecking after two weeks have past and your items are still not here.