Here is a list of the 3d printed parts and assembly instructions: http://imgur.com/a/HgOea
The non 3d printed components can be purchased here:
Motor - $13 https://www.sparkfun.com/products/12285
Switch - $0.75 https://www.sparkfun.com/products/9609
9V Battery Clip - $1.25 https://www.sparkfun.com/products/91
(I used a battery clip I had laying around so you may need to cut and solder the wires)
You will also need some super glue.