Specifying Machines From DELL
-You have to create an account on Dell's webpage http://premier.dell.com/ - Using access code UCB and Access Key as buydell - Then, you pick the computer out, and complete an e-quote.
Once that is done, you go to the TSW web store at,
https://www.tsw.berkeley.edu/eStore/equotes.tpl
And from there it is (possibly) self explanatory.