Wltoys A979 1/18 Scale Realistic 4WD 2.4GHz RC Truck Monster Racing 50KMH High Speed Car Model - BLUE
PayPal added $5 at checkout for currency conversion. I went back and got it for $75.83 by paying directly with VISA.
I just purchased one of these. I have been watching the price and this seems good. I've never used one so can't vouch for them but it looks good in reviews and on YouTube. Very fast (probably not good for under 12 YO kids) but reviews say it's fragile. Spare parts are available.
Other models are available but this is the cheapest one. Same model is available from banggood.com for +$5
http://www.gearbest.com/r-c-cars/pp_136292.html = $79.75 AUD
Hobbyking is having a sale
http://www.hobbyking.com/hobbyking/store/__910__908__Cars_Pa…
Lots of cars here, ready to run, for similar prices, tonnes of spares available, and I expect they might be a higher quality (all brushless motors, not brushed like the gearbest one).
1/18th 4WD buggy, with controller, AU$56.46 (you have to add postage, but it's reasonable).
1/18th 4WD Short course truck $57.29
1/18th 4WD Stadium truck $72.80
Or my pick, with great videos of it racing online.
1/16th 4WD buggy, $99.26. Very fast well setup car.