Ant, welcome to the forum!!,
If you want to get a digital track with a powerbase the scalextrix lane change challenge is worth around $350 (I think, you could probably get one from armchair racer which is in sydney also im pretty sure slotshop is from there also...
Link to
Armchair Racer
SlotShop
The adresses of where they are should be on the site somwhere
Cheers.
Jake