I bought an extra mirror from a member, but not needed. I just keep all my stock stuff, for some dumb ass reason. $40
Has all the goods. Took about 3 weeks, because the PLX screen is a little dimmer than the AEM setup, so they had to order a special mirror glass piece to make it work. Sent them my extra mirror, they sent it back with all the PLX goodies.
The mirror setup was right around $500, plus the 2 modules for boost and Afr were another $400 or so.
Not a cheap mod, but I really, really hate gauge pillar pods and everything else out there for our cars, so it's worth it to me.