My friend told me about TinyTree's range of Japanese diapers that are amazing but can't be found at supermarkets in Singapore.
Good range of diapers in different sizes. They took around 1 week to deliver though as it was based on pre-order because they ran out of the products i'm assuming.
I like how they also offer a cash-on-delivery option and call the day before to confirm their delivery. Customer service is great here and their Japanese diapers are hard to find anywhere else!