Larry, I don't own a WII fit, but I have some friends that do, and I have to say that I LOVE it. I can play for hours. I usually have to get dragged away from it.
As for inexpensive exercise, look into community sports. Around here there are softball leagues geared towards "fun" not serious competition, and during the "off season" many of these folks get together for Sunday pick up games. Also, my local Armory has pick up volleyball every Monday night for all levels. For a $20 yearly membership, you can use the Armory as often as you like, for the pick up volleyball, basketball, whatever. Also, going to these things usually gets you in touch with folks that are in leagues. And they are almost always looking for someone. There are also special interest groups that have leagues like total beginners, over 50, or "just for fun". So, check out what your county is offering.
On the other hand, you could get a personal trainer... you may pay a lot more out of pocke for it, but when you actually pay (and have someone to answer to) you tend to go...as opposed to having a membership at a gym...who'll know it you don't go?