In Oz, they seem to be unobtainium from the usual "bricks & mortar" shops.
They have the cast aluminium ones, but they all seem to be in silly sizes----if the depth & width are OK, they are usually too shallow in height.
Either people don't build projects in the traditional boxes any more, or they do, & the perceptions of Jaycar & Altronics are skewed, but the result is the same.
I haven't looked on eBay, but they will probably have the usual ones from North America, with a reasonable B.I.N price, but postage of $795 to Australia!
