What will the case be used for? Travel or just to the range? Does it need a lock?
Is it for a single hand gun or multiple?
If it is for normal range use I would recommend this one. MidwayUSA Tactical Pistol Gun Case - MidwayUSA
They are on sale right now too for $7.99 and available in Black or Olive Drab.
If he needs something for multiple guns or serious travel, I recommend Pelican.