Not overall sure how this thing works, if it's just a slot car set you control from a mobile app or it's a programmable thing, but I got it anyway, for $39 marked down from its original release price of $299. I'm assuming if you buy a few sets you can expand the set, but not sure. I Will give it a try later on in the week.
Delivery seemed overly expensive, so I just picked it up from the Knox store. Seems to some around Melbourne, good luck finding one.
These sets are so old now that the batteries in the cars are likely dead beyond repair.
Read the reviews before you buy.
I don't think these have been manufactured for years now