This may be a off track but I think it is good advice.
Get a personal trainer. Why? Because if you calculate the money you're going to be spending on high quality GNC pills ($200 a month or more) you can probably find a young college student or trainee at your local gym (who will work a deal out) that will get you going. If you have a motivated friend - even better. Just make sure the routine you plan is a solid one that tones and shapes evenly and doesn't kill you.
Granted the gym membership costs aren't factored in but nothing moves you to push yourself like a trainer. Once you have one, you'll know what I'm talking about.