Get ahold of me. My Dad brought a bunch of them home over one summer to do the same thing, and never got around to it. I've been wanting to get rid of them for a while now, and didn't know what to do with them. They are the white ones that are, I would guess, 25-30 gallons.
I just called my Mom, and she is gonna check tomorrow to see how many are there. I say there is over 6 of them.
You can have them for free, just come get them. They are up in Clarkston, between Mt. Holly and Pine Knob.