I've already suggested a good cheap simple low part count way. It will work perfectly fine unless you expect to have large unbalanced DC loads. Since you haven't said what the PSU is powering or even basic specs on what quality of regulation you need etc it makes it very hard to suggest options.
People ask mystery questions expecting forum users to do MORE work guessing at every possible solution and then you want to go and make profit from our work. Thats pretty uncool.