Have any municipal gyms in your area? They're often very cheap...anywhere from $25-$100 for a year. You may not have the convenience of working out in your own home, but it may be a cheap alternative (and you may have some left over cash for the camera.)

I don't like ankle weights, as they can stress your knee joints. I know it's not cool to bash another art, but of all martial arts, I probably dislike TKD the most. I've seen too many groin injuries from the intensive stretching; not good for a runner, I'm sure you know. I've been involved in martial arts for over 30 years; not that TKD has no value, I just think there's more effective arts out there (and possibly cheaper for the dues.)

You sure you want to lift heavy? The extra bulk can actually slow you down. Good luck.