Has anyone seen or used one of these

Did some quick numbers, if the box is

15in wide x 24in long x 8 in high, then it looks like about,
$117 Aus for up to 11 lbs (5 kg) and $185 Aus up to 22 lbs (10Kg)
Postage will vary a litte depeding where it's sent from.
Sydney postcode 2000 would be a little cheaper.

Metric, Width: 37.46cm x Length: 60.02cm x Height: 19.05cm
Auspost calculator Postage calculator & delivery times - Australia Post

Dang, with the exchange rate that's still less than $300! That could be an option.