I had to buy 1 metre of ag-pipe (has lots of holes in it), 10 bags of washed sand, and 5 bags of organic soil. All the rest was reused. I had a spare 1 metre of ag-pipe, PVC pipe, gaffa tape, plastic tarpaulin lining, staple gun and staples, and the contents of two compost bins, all for free! Total cost of materials today $60.
Just one tip. Cap off the end of the ag-pipe so that the water doesn't just flow straight through. You want it to distribute evenly throughout the bed. I just hope the gaffa tape holds it all in place when it gets wet.
I will be planting it out tomorrow after my radio interview. More photos tomorrow night friends with lots of salad veggie seedlings and mulch to stop evaporation.