Find these 50L storage boxes from the Reject Shop. It seems to be both have wheels.
$5 for the black color
https://www.rejectshop.com.au/All-Products/Home-%26-Garden/H…
$7 for the bright color ones.
https://www.rejectshop.com.au/All-Products/Home-%26-Garden/H…
Roller Box 50L with Lid Black $5 Or Bright Colors $7 Each @ The Reject Shop
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Great deal, reminds me of this from Officeworks.
https://www.ozbargain.com.au/node/260059
Ozbargain is a funny place though, if, it costs $5.50 from Officeworks it gets almost 60 votes. But this deal, with wheels and costs less, barely gets on front page.
weird…