We all know that buckets are not cheap but here is a way to get them for free...
While you're driving around, keep an eye on the side of the roads. You wouldnt believe how many buckets you can find that have fallen out of various vehicles and from those (who dont care about the enviroment) that just throw them out of the window as they drive.
This past year alone, I have acquired 33 buckets of various sizes. Not only was I picking these up for trapping purposes, but I was also helping clean up our enviroment.