The UK Smash Palace case isn't a Criterion style case, it's just a regular amaray but clear. Any regular AU case will fit the cover. If you're after a clear case, a PS3 case is probably the quickest and cheapest way to get one.
I'd just search through Ebay AU.
https://www.ebay.com.au/itm/Premium-...QAAOSwCtJaWGyQ