I'd go with the community garden like IceNine mentioned. Most towns have them. If yours doesn't, ask around. There might be people who will let you garden on their property--especially if they get a cut of the harvest.
We once had a garden way in the back of the big lot behind a warehouse. They let us use it for free (a relative worked there). We used our bikes to get there to tend the garden. Water availability was a problem--we had to lug big buckets about 100 paces to irrigate.