I have a LARGE peice of slate that i'm willing to custom cut for base peices for drift wood etc, the whole sheet measures ~4'x7'x 1/2" thick. Due to the huge weight of the slate, I'm not willing to ship it (it would be cheaper for you to go to your local store and buy it)
So, my offer is this, if you need/want any and you are in the GTA (toronto/etobicoke/brampton/mississauga/oakville etc) area, feel free to email me @ email@example.com
or contact me on the board to make arrangements.
Side note, I have all tools necessary to cut/drill and mount any piece of wood for a tank.