Where to find RO parts?

My DI stage on my RO filter has an incessant leak. I don't think it is the fitting nor the o-ring. I suspect the case may be cracked. IS there anyone local to the area that sells RO parts, stages, etc? I am on the north end of town.

I may have to resort to mail order I suppose.

Severum
 
NDA may sell the shell.
You can call them to see if they have it and how much money they
want for it?
 
might try home depot or lowes where they have water filters or elliots hardware
 
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