I did a google search for "plastic containers" and found a firm that do recycled ones for £1, might have been the same co Dougie mentions. I get mine for nowt off a farmer customer of mine,they get the cleaning fluid for the milking machines in them,but they are non-returnable and they aren't allowed to burn them.Last time I was there he looked @ the trolley system and told me he could get me any amount of them, so try your local dairy farm, they may be glad to get rid of some.