Saw these in my email inbox from Wiltronics (which are also sold by Jaycar and on ebay.)
Also: https://www.wiltronics.com.au/product/35562/robotic-arm-kit-… (Was $149, now $55). Looks like this one
Battle bot cheapest elsewhere (jaycar) about $95.
Postage around $30 depending on where you live.
I got the battle bots from Jaycar for my elderest a few Christmas ago it's fun