Ignoring infra-structural items like baseboards; tools; wiring etc, here are some of the key elements and their approximate prices.
Locomotives cost between £250 and £350 - but DCC equipped models cost more. By that I mean locos that come with a DCC chip already wired up.
Carriages cost approx £35 each.
A set of PEKO points costs approx £11.
A metre length of PEKO flexitrack costs approx £3.
The Prodigy DCC control/power unit costs approx £275
Considering going to see South Pacific in Edinburgh. Always liked these old musicals. Decades ago on a Wednesday evening, BBC2 had a slot called "The Hollywood Musical" - was compulsive viewing for me.