Do you have the budget to invest a bit at a time to get some videos and maybe a little equipment?
Cardio videos are great - they get your heart rate up, they require nothing but a DVD player, and you can do them at home, according to your schedule. You'll probably get bored with those two videos pretty quickly, though. So you might consider making an investment in some more, maybe even some with increasing difficulty levels so you can go up a level as you progress. I have found some really great deals on videos from sellers on Amazon Marketplace, both new and used. I think I ended up with 5-6 dvds for around 40 dollars.
I am also REALLY fond of strength training - I think it, more than anything else, made me feel strong and helped motivate me to keep going on my loss. It really was key, for me. Luckily, the things you need to do it don't have to be expensive. A few sets of dumbbells would be good, in varying weights (usually 8-15 dollars each, depending on weight). Alternately, you can get some resistance bands fairly inexpensively. There are a TON of resources out there on exercises to do with these...you can check out the Ladies who Lift area here, or you can look at About.com's exercise site or Stumptuous, both of which will give you ideas galore.
NOW - if you don't have budget (and these days, most of us don't) to get much else right now, there are still PLENTY of things you can do. For cardio, you can get creative...I will sometimes do a whole cardio session just dancing up and down on a step in my backyard...I call it freestyle step aerobics
You just step/kick, step/knee lift, whatever, to get your heartrate up. Crank up your music! Look around your house to see what "built in" equipment you might have.
For strength training, there is a LOT you can do with no equipment whatsoever...just your body weight. Lunges, squats, pushups (against a wall to start, then increasing until you're on the floor)...the sky is the limit. You can google "Body Weight Strength exercises" and get a whole ton, I'm sure.
What's your exercise plan?
So I have a calendar from beginnertriathlete.com that tells me how much of each sport (swimming, biking, and running) to do a day, and I just do it. For swimming I go along with my husband to the gym (he's a gym rat), biking I'll often go to the gym for spinning classes, or sometimes out on my own in the neighborhood, and running I'll usually do outside, though sometimes on the treadmill at the gym. Depends on the day. I love the flexibility and variety, and it's very very motivating to know that in 3 months, I'm going to be putting on a wetsuit (!!) and racing through 3 different sports for close to 2 hours! Yikes!! 