Everything you may need to buy is on the kit of parts website(as long as it is in the kit of parts.
the site specifies
www.ctlcorp.com/go/first as the place to go to in order to purchace a new classmate but what vesion you had and the image drive may be needed in order to order a new one
check also to make sure this is nogt taken off of the 3400 dollars you are allowed to spend
it will set you back around 450 dollars but you can add extra features that other teams may not have like adding anouther gb of memory or updating the solid state drive.
good luck