Lego parts are discounted when ordering through the FIRST site. After you register your team (https://my.usfirst.org/ftc/tims/site.lasso) you should have access to a special ordering page. For some parts (specifically an extra NXT brick, I think), you must go to the standard, LEGO site. ( http://search2.lego.com/?q=nxt&lang=2057&cc=US )
FIRST has recently approved a new set of robotics parts that are different than the LEGO / Tetrix. New robotics school programs might wish to examine this different set. Link to Matrix Robotics System.
Teams should also study the rules for extra materials carefully. It appears that more has been approved in recent years (eg. aluminum stock, drawer extension tracks, etc.)
The FIRST Tech Challenge Game Manual includes a section describing allowable parts and raw materials.
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