any advertised Dell should show somewhere what Dell name E-value code . when you go to Dell site then on toolbar at top right is option to "shop by E-value code" have you tried this. if you still have difficulties then phone them if you really want information.
When you configure the website price, you will find that adding and subtracting certain items will change the price. The same thing applies to their offers. Same model sold with free items like extra ram,bigger hard-drive, free delivery etc. Special voucher codes and media promotions will also give a price change. If you are looking at a particular computer, phone Dell and ask if there are any special offers to be add.
Should mention that Dell are not the cheapest for add-ons to standards specification price. Best to check the price and compare these with other suppliers of components. As an example look at the hard-drive differentials.
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