Rola Roof Luggage Box

Looking at purchasing a Rola Roof Luggage Box

At the moment, Repco has the Odyssey Series on special for the 360 litre one for $299 (30% off) or $399 for the 450 Litre one (25% off) until 24 Dec.

Is this the best deal around? Or should I wait for Boxing Day sale?

happy to purchase second hand if there's a good deal around (i've checked ebay and gumtree - not worth the trouble in my opinion)

Thanks