Yes, I've been given gift certificates that are good at any vendor in the market, although I'm not sure where they were purchased.
I don't think I've ever known them to offer gift certificates like that. If anything, some vendors might offer their own individual gift certificates/ gift cards themselves, but even that's a bit iffy.
I dont believe so but i have never asked. I dont think they have a main office for customers. I would call their main number. It would be worth it.
Thanks! Your answer is awaiting moderation.