Double wiring method practiced by Hiromi Tsukada in Japan to achieve great movement in young branches on trees in training. Note the minor wiring scars to the left on the thicker portion of the branch that are almost healed completely. Only by time will those scars be unnoticeable.
Evergreen Gardenworks - I stumbled onto this source for affordable Bonsai material because I was looking for Bald Cypress. They have the classic material specialized for Bonsai trees. If you want something more exotic, like Jaboticaba, you will have to look somewhere else. If you join a Bonsai club, they can point you to many great sources for Bonsai material. You can also get great material at your local garden center. I have many, many choices for that on this board!