In case you haven't heard, The Perfect Sketchbook B5 has just been relaunched as a limited edition. If you're not familiar with it, it's a high-quality watercolor sketchbook made with Fabriano Artistico, one of my favorite 100% cotton watercolor papers. Originally the product of an Indiegogo campaign in 2015, it was designed by Erwin Lian and produced by Bynd Artisan in Singapore. I just completed my first one and I have to say that it was a very pleasant sketchbook to use!
There are still some available, so if you're interested in watercolors I would definitely recommend buying one before they run out!