This bundle contains all the necessary stuff to get your structure going. Well built no burrs or sharp edges. A fine addition to the starter kit. Down side: it's kinda pricy for a high schooler and could use a few larger sheets of flat decking.
VEX-276-2161 VEX Hardware Kit
Just what I needed to make some modifications to my VEX robotic projects. A bit pricy though.
VEX hardware kit
Good start for building prototype system. Decent selection of bushings, fasteners, support members and such. Not sure it is worth nearly $80 but got us working quickly...