1999 Jetta: Armrest

I have a base model 99 Jetta that I love to drive. My only complaint is that it does not have an armrest. I have driven another Jetta that had one. My question is how difficult are they to put in? I called the dealership and he said that it is a major ordeal to put one in. Major ordeal = $$$$ It looks like it attaches to the back of the console.
Thanks,
William