Don't give up! I'm poor, too! I have a pair of Nike shoes that I bought for $20 because they were "last year's model". I would suggest going to your local sporting goods store and telling them you need a running shoe that is on clearance, and the salesman will hook it up!
Actually, right now I'm walking/running in a hiking shoe because it's less worn out and provides better foot support. I'll be shopping for a running shoe in maybe about 2 weeks.
~insert motivational cliche here~
| current weight: 238.0