As I said to a coworker tonight, WW is the only viable alternative because you can do it for life, without having to deny yourself something. It's the quickest way I know to get me to go after the wrong thing - tell me I can't have it!
So it is the most sensible way to go.
There are a lot of people I know who do the on line version, because there are no meetings near them. If budget is an issue, I've seen people who do it all from the message boards, get the info they need, go to those sites mentioned and work from there. Some people have also bought the material off of eBay, so they have the booklets and work from them.
The thing you really need is commitment. If you're doing it on your own, sites like this is where you'll get the support and help you need. You've already had great success, so you're well on the way.
If free time is NIL, is the gym going to be feasible for you? For me, I just have an exercise bike that I get on in the livingroom, and will only allow myself to watch certain tv shows or videos when I'm on the bike. It can be a great motivator! And even getting a couple of Sweatin' to the Oldies can do more than paying out for a gym membership, so that's something to consider. And the great thing with something like that is the kids can get involved as well, because the music is fun.