Check out my DIY veggie patch. I just grabbed some wooden pallets that were free to good homes in an industrial area close by, some styrofoam boxes from friends that where on light and easy (you would also get these from your local grocer) and added some hessian material that was laying around. (You can pick this up from a material and crafts store). It came together quite nicely. If you want to give it a go just remember to poke drainage holes in the bottom between the slats in the pallets. My garden beds are not Gardening Australia Magazine worthy but it felt good using second hand and recycled products at no cost to make something that will grow food I can eat and minimalise what I buy in the weekly shop.