Think we still have 54R steel case but don't remember seeing much of it. IIRC our 54R has always been cheaper than what you paid in the US which is rather odd.
My LGS has a lot of cases of 39 non corrosive but it costs more and that is the down side.
Here in Canadaa couple years ago we were awash in 39 corrosive however all good things come to a end and maybe we have seen the last of the abundant supply.