I didn't note the price (they are usually overpriced for pretty much everything though so I'd say "not cheap") but Gametraders in Macarthur Square NSW had these for sale as well, so they aren't exclusive to the easter show at least.

Side note: I wouldn't be surprised if the ones at the easter show are unlicensed/knock offs, a lot of unlicensed/knock off items are sold at these types of events, so if anyone does buy one at the easter show and it's of low quality/falls apart don't be surprised.