I ordered 6 books and magazines from 博客來 Books.com.tw on 7 Aug 2015. They arrived at Lotpost's Taiwan warehouse on 10 Aug 2015. It's already in Hong Kong on 12 Aug 2015.
The package weighs 6.9lbs and costs only HK$105 (7lbs x $15/lb).
Lotpost is fast and affordable. It's cheaper than using the delivery service of the bookstore. It's perfect for buying books and magazines from Taiwan.