One of my favorite things about the community garden is that (aside from the uber-minimal $30 a year fee for water, I suppose) there are so many bits of this and that lying around that you can really just about garden for free.
Case in point--last year I planted some cabbages which were promptly torn to shreds by the bunnies in the neighboring field. This year I decided some protection was in order, so I stole a few pieces of chicken wire from the garden shed and made these cages. They're basically just tunnels staked into the ground on the sides and bent down at the ends. We'll see if they keep the rascally rabbits out.