1) Save your pennies for decent running shoes, as I'm pretty sure there's open road or other terrain near your house.
2) Jump rope.
3) YouTube tutorials.
Good idea. Even though I suck at using the jump rope, I will try to keep fit at home this way. Although I really want to train my fitness basing it on a particular martial art.
Another thing is to take the Evan Tanner/Rich Franklin route and get together with friends, get some instructional DVD's and work it out together
That would be an awesome idea, however not many of my friends are into MMA. Even if they were, they wouldn't be bothered training it with me. :P
I guess I gotta get myself a job. Earn 900 dollars and pay a 6-month BJJ training contract.