The Envy lounge is located right in front of the Steakhouse in the Renaissance. It's a hidden gem but known to convention vets.
Why pay $$$ inside the convention hall for reheated frozen crap when you can step right outside and head over and grab a custom made Envy Signature Burger. I always make sure to stop for one when I'm here for CES or SEMA. Yeah it's $14, but it'll be better than anything from the concession stand. And you'll get to relax while you enjoy it before heading back over to the show floor or calling it a day.