You can usually get pads in the art section of the craft store. I actually am from about the last group of engineering students that had to draft by hand. I have a serious addiction to pencils (neat writing implements), drawing tools, and paper. I buy tracing paper on the roll (much more cost effective) at my art supply place (which also sells professional drafting stuff). For pattern drafting, I have inexpensive, big roll (5') of tracing paper. Won't use my good vellum or albanene for that. But, I love the feel of the really good tracing paper - some stuff called Albinene - it's kind of like a glass feel to it - heavy weight. And I also have tissue weight tracing paper, but I prefer slightly heavier than tissue. It's just fun and useful to be able to unroll that big roll over a laid out pattern and then start drawing in adjustments.
Great stuff to play with.
Ellice