where can I buy a lefthanded keyboard?

any one know where I can buy a lefthanded DELL Precision M6400 Keyboard and mouse? So one of my co-workers is lefthanded and we need a keyboard and a mouse. I have gone to every site that I can think of and they are either not dell compatible or they are PS/2 adapted. I need a keyboard and mouse that are USB adapted and that work with any computer and hard drive if I can get them to be wireless that would be great, but really I need it to work with any computer and every program