If there is a foreclosure around you, there's your source for another can or 2 if you dont mind borrowing. Or ask a neighbor for theirs if they are moving. That's how I got my 2nd can.
Now for the fun. Make it a game to see how high you can stack the crap. Don't pIle it on the lid as they won't take it, but if the lid is open, feel free to pile it 10 feet tall. They still take it. I've put appliances on top, and they take it if the scrappers don't.
Ha! That thought had already occurred to me, but from what I've heard, if something falls out while they are attempting to dump the can, they just leave it on the ground. If that's the case I'd just have to clean it up myself anyway.