The price for the V/Locity cars will be the same as for the current order. The cost for XTraps has been the same for a decade - $18 million for a six car set. The additional trams will be slightly more expansive than the current order due to the inflation factor contained in the original order for the exercising of options.
It's a pity that related costs like on going maintenance, stabling facilities and other assorted addons aren't given separate line items within the budget papers. But of course, the whole point of the Budget Papers is to make things as difficult to find out as possible. That was Kennett's plan when they moved to the current format, and successive government have only made it worse (from our viewpoint anyway). People want to know what you are going to spend, on what, and when and how the revenue to pay for it will be raised. The cash surplus figure is far more illustrative than that offered by the "accrual accounting" derived surplus figure given headline treatment. It only needs to be ten pages. The rest is crap designed to confuse.