Arduino Components: TReX Jr Motor Controller

RobotShop.ca has these pre-built motor controllers availble for about $50. Good for 2.5A, I use this little guy for any wheels or servo motors that need to move a load of some kind.

This biggest problem is trying to mount it with the small screw holes located in three of the corners. Poster-tack seems to be the easiest way to model something quickly.