I would just look around the town you live in and try and figure out what companies use chemicals and then just ask them what they do with the containers. I would not offer money because a lot of times you can get them for free. They will sometimes be glad to get rid of the containers without having to haul them somewhere or pay to have them disposed of. Some have deposits on them so you might get away with paying them the cost of the deposit. I have went looking around industrial parks and found one that had some empty containers laying out back and they gave them to me. You can also find the 275 gallon tanks that way too.