I don't have my section book to hand, but none of those sound standard sizes for RHS or even ERW.
Sometimes less common 'standard' sizes won't be manufactured unless your wanting tonnes of it.
Don't know what your planning to do with it, but we've sometimes made thicknesses up using RHS with a flat, or a number of flats welded to one/two faces if its not seen.
If it's only a small amount you want, could you not get a local fab shop to knock you up some channel out of sheet/plate (half the size you want), and then weld them together?