Where the rest of my recommendations tend to be for specific products, this one is a little more general. It's about printer paper.

As discussed in Lesson 0, printer paper (A4 or 8.5"x11") is what we recommend. It's well suited to the kind of tools we're using, and the nature of the work we're doing (in terms of size). But a lot of students still feel driven to sketchbooks, either by a desire to feel more like an artist, or to be able to compile their work as they go through the course.

Neither is a good enough reason to use something that is going to more expensive, more complex in terms of finding the right kind for the tools we're using, more stress-inducing (in terms of not wanting to "ruin" a sketchbook - we make a lot of mistakes throughout the work in this course), and more likely to keep you from developing the habits we try to instill in our students (like rotating the page to find a comfortable angle of approach).

Whether you grab the ream of printer paper linked here, a different brand, or pick one up from a store near you - do yourself a favour and don't make things even more difficult for you. And if you want to compile your work, you can always keep it in a folder, and even have it bound into a book when you're done.