If he's got enough money he'll find a resin caster that will happily make a resin copy of the Welly 997 (which is superb, I modified two of those you see in the pic above).
So, buying a ~ € 12,- DieCast is one option. Having one cast in resin will cost anywhere between € 100,- and 400,-
Oh... now that we talk about it. HobbyDesign sells a Resin kit of an Audi TT - a 100% copy of a really nice DieCast. Now... does that make sense?
Buy a DieCast, take it apart and you have a nice kit to start with