While students don't normally need to purchase art supplies, here is a great list of art suppliers along with a list of art teacher favorite items.
Permanent markers with a chisel tip and brush tip for precise coloring.
Sketchbooks range in price depending on their style and size. If it will be used for any painting, marker, or gluing a heavier paper weight (400 pound) will be more durable than one made for graphite and charcoal (50 pound) and this is usually listed on the cover. These are great to store ideas and projects in!
These Wacom drawing tablets are wonderful for digital sketching. They basically plug in with a usb cord and come with a stylus. They work with any drawing program such as Chome Canvas. They are affordable and make great gifts!