The library should have videos you can check out. Plus, I'm sure some friends or family might let you borrow theirs. If you can afford it, rent some from Netflix or Blockbuster. Once you know which ones you really like, you could start buying them as you can afford to do so. You can buy them used on Half.com or Amazon.com. If you're willing to use a vcr, you can save even more if it's available in that format.
Do you live in an apartment that has a gym? If so, 30 minutes a day on the treadmill would be great exercise!
Mall walking is another option. I hate it, but some people like it. And it has A/C!
If you live somewhere that's cooler at night, you could walk some lit park trails or find a tennis or basketball partner and play on the lit courts. My racket was $12, the bag of tennis balls was $6 and the basketball was $5. Or, you could just walk on the sidewalk.
I got some ankle weights from Gart sports for about $20 and I lay in bed watching tv and do various kinds of leg lifts. You don't even particularly need ankle weights for that, normal leg weight provides enough resistance but I'm really want to build alot of muscle.
Also, if you can get these types of items used on Craigslist, all the better.
Do you have a neighborhood pool or anything that stays open after dark? If you like swimming, it burns alot of calories and you don't even feel it! I use to do that at the pool at my apartment until they made the hours dawn to dusk
I love those little mini trampolines. I see them posted ever so often on Craigslist for somewhere in the vicinity of $20.
If you have cable, you could record those exercise shows in the morning and play them back whenever.
At this link here:
http://exercise.about.com/cs/exercis...out_center.htm there's a ton of different exercises you can do, it has pictures and instructions.
That's about all I can think of. It's 2 inches above **** where I'm at too, and I've had some real problems this summer with trying to exercise and being heat sensitive. I go to Curves mainly, but the idea of getting in a hot car, driving in traffic in the hot sun to spend 30 minutes getting all hot and sweaty only to go out to a car that's 130 degrees inside and drive back home just is NOT appealing to me. I've already nearly passed out once trying to do it against my better judgment, so i'd just be happy to maintain during the month of august and start back to the Curves routine (and my hiking!) in September when it's cooler. Heat can really hurt you so I empathize.
Good luck!