Here are the 10% off coupon codes from Book Depository. They are only valid on the dates listed.

Consider supporting Parka Blogs by getting your books through the Book Depository affiliate link (below).
I earn some commission at no extra cost to you. Money is used to get more books and art products to feature on the blog.

https://www.bookdepository.com?a_aid=parka

Valid dates: 3rd-16th January 2019
Hong Kong: HK10

Valid dates: 15th-27th January 2019
Netherlands: NL10
Israel: IL10
Belgium: BE10
Sweden: SE10
Philippines: PH10
Indonesia: ID10
South Korea: KR10
Switzerland: CH10
Greece: GR10
Romania: RO10
Slovenia: SI10
Malta: MT10
Serbia: RS10
Turkey: TR10