Thanks. I have checked. Brooks and New Balance don't offer it. Nordstroms has a mismatched size plan, but will only accommodate different lengths, not different widths.Many brands actually has the ability to order customized shoes that lets you have mismatched sizes. I don't recall it being cheaper but It might cheaper than 2 pairs. check the website of the brand he likes.
I haven't figured out what to do with all these odd shoes that will never be worn.