I guess if you were going to do it regularly, then starting to buy some kit to make things a little more comfortable would make sense (I just replaced my 10 year old general purpose trainers with proper running shoes this weekend after 3 months getting started and making do, only because I tried to wash the trainers in my washing machine and the soles fell off...). My point was that even if you have basically nothing or don't want to commit any money towards it, you can still do some running and it might make you feel a bit better 
It's like free drugs! Fairly rubbish ones that require some effort to get, but free drugs all the same.

It's like free drugs! Fairly rubbish ones that require some effort to get, but free drugs all the same.